Drug-induced psoriasis: clinical perspectives
Authors Balak DMW, Hajdarbegovic E
Received 6 July 2017
Accepted for publication 18 October 2017
Published 7 December 2017 Volume 2017:7 Pages 87—94
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Prof. Dr. Uwe Wollina
Deepak MW Balak, Enes Hajdarbegovic
Department of Dermatology, Erasmus University Medical Center, Rotterdam, the Netherlands
Abstract: Exposure to certain drugs can elicit an induction or exacerbation of psoriasis. Although well-conducted systematic studies on drug-related psoriasis are mostly lacking, traditionally strong associations have been documented for beta-blockers, lithium, antimalarial drugs such as (hydroxy)chloroquine, interferons, imiquimod, and terbinafine. More recently, new associations have been reported for monoclonal antibody- and small-molecule-based targeted therapies used for oncological and immunological indications, such as tumor necrosis factor-alpha antagonists and anti-programmed cell death protein 1 immune checkpoint inhibitors. Recognizing potential drug-related psoriasis is of clinical relevance to allow an optimal management of psoriasis. However, in clinical practice, identifying medication-related exacerbations and induction of psoriasis can be challenging. The clinical and histopathological features of drug-provoked psoriasis may differ little from that of “classical” nondrug-related forms of psoriasis. In addition, the latency period between start of the medication and onset of psoriasis can be significantly long for some drugs. Assessment of the Naranjo adverse drug reaction probability scale could be used as a practical tool to better differentiate drug-related psoriasis. The first step in the management of drug-related psoriasis is cessation and replacement of the offending drug when deemed clinically possible. However, the induced psoriasis skin lesions may persist after treatment withdrawal. Additional skin-directed treatment options for drug-related psoriasis follows the conventional psoriasis treatment guidelines and includes topical steroids and vitamin D analogs, ultraviolet phototherapy, systemic treatments, such as acitretin, methotrexate, and fumaric acid esters, and biological treatments.
Keywords: psoriasis, drug-induced, psoriasiform, cutaneous drug reaction, beta-blocker, lithium, monoclonal antibodies, small molecules
Psoriasis is a chronic, immune-mediated inflammatory skin disease that is associated with a high physical and psychosocial burden of disease.1 With estimated prevalences reaching up to 11% in adults and up to 1.3% in children, psoriasis is a common disease.2 Consequently, psoriasis is frequently encountered in clinical practice, by general practitioners and dermatologists alike.
The etiology of psoriasis is multifaceted. A complex interplay between genetic predisposing factors and environmental factors leads to the onset of psoriasis.3 In addition, various triggering factors have been linked to an exacerbation of psoriasis, such as infection, physical trauma to the skin (ie, the Koebner phenomenon), and exposure to emotional stress.4
Another clinically important external factor that can elicit psoriasis is exposure to drugs. There are several ways in which a drug can affect psoriasis (Table 1).5–7 First, a drug can cause preexisting psoriatic skin lesions to aggravate. Upon discontinuation of the implicated drug, the psoriasis exacerbation can decrease (ie, drug-induced psoriasis). Alternatively, the induced psoriatic skin lesions can persist (ie, drug-aggravated psoriasis). Second, a drug can cause onset of new psoriasis lesions at clinically uninvolved skin in a patient with a personal history of psoriasis. Third, medication-use can provoke psoriasis de novo in a patient without a personal or family history of psoriasis.
Table 1 Possible scenarios of drug-related psoriasis
Certain drugs have been linked strongly to psoriasis. Examples of these include beta-blockers, lithium, antimalarial drugs such as chloroquine, interferons, imiquimod, and terbinafine.5 In addition to these, new targeted treatments with monoclonal antibodies and small molecules used in oncology and immunology may induce psoriasis. Furthermore, rapid treatment withdrawal of systemic corticosteroids or potent topical corticosteroids may elicit a psoriasis flare (ie, rebound effect).8
Recognizing the potential role of medication in psoriasis is of clinical importance, considering that drug utilization is in general high among psoriasis patients.9 This may be due to the treatment of systemic comorbidities that are linked to psoriasis, such as hypertension and other cardiovascular diseases. Alternatively, surveillance bias may underlie the increased drug utilization among patients with psoriasis.10 Whatever the underlying reasons, the relatively high number of medications used by psoriasis patients makes potential associations between medication use and psoriasis exacerbation or induction relevant in clinical practice.
However, in daily clinical practice, there may be insufficient attention to potential involvement of medication-related causes for psoriasis induction, exacerbation, or treatment-resistance.11 Moreover, identifying medication-related exacerbations and induction of psoriasis can prove to be difficult in daily clinical practice for various reasons. First, the association between drugs and psoriasis onset and/or exacerbation is frequently not well-studied, resulting in a low level of strength in terms of evidence. Second, the lag time between start of the medication and onset is variable and can be quite lengthy. Third, in some cases, the psoriasis flare can persist, even after the suspected drug has been discontinued. As a result, the clinical identification of drug-related psoriasis can be challenging.
Taken together, recognizing potential drug involvement in psoriasis is of clinical relevance to allow an optimal management of psoriasis.5 This review is aimed at giving a comprehensive overview of the clinical presentation of drug-induced psoriasis.
This narrative review is based on a nonsystematic literature search in Medline and Embase databases. The search date was performed in January 2017 with an update of the search in June 2017. The following keywords were used: “psoria*” and “drug-induced”. We included articles written in English reporting the development of psoriasis related to medication use either in children or in adults. There were no restrictions set in study type. We focused primarily on articles from the last decade. In addition, we included several reviews written on drug-induced psoriasis.5,6,12–15
Potential drug involvement in psoriasis
In clinical practice, identifying drug-related causes of a psoriasis flare can be difficult for various reasons. One complicating factor is that the latency period between start of the medication and onset of psoriatic skin lesions can vary considerably between drugs. Medications with a typically short latency period include terbinafine, whereas lithium and beta-blockers can be associated with relatively long latency periods up to 12 months.11 Consequently, a temporal relationship is sometimes not immediate apparent. A psoriasis flare in the absence of known triggering factors such as infection and emotional stress should raise the possibility of a drug-related cause. Another issue is that the psoriasis flare can persist following discontinuation of the suspected medication. Moreover, there may be little difference between “classical” psoriasis and drug-related psoriasis in terms of clinical and histopathological features.
A tool to help to better discern potential causal drug relations is the Naranjo adverse drug reaction probability scale.13,16 The scale consists of 10 questions, the scoring of which results into four categories: definite, probable, possible, and doubtful (Table 2). Assessment with the Naranjo scale could be helpful for clinical practice to strengthen a possible drug association.
Table 2 The Naranjo adverse drug reaction probability scale
Note: Reproduced with permission from Naranjo CA, Busto U, Sellers EM, et al. A method for estimating the probability of adverse drug reactions. Clin Pharmacol Ther. 1981;30(2):239–245.16 © 1981 American Society for Clinical Pharmacology and Therapeutics.
Of note, the available evidence supporting the associations of drug-related psoriasis with various drugs is limited predominantly to anecdotal single-case reports or retrospective case series. Exceptions to this are beta-blockers, lithium, and tumor necrosis factor (TNF)-alpha antagonists, for which the associations with drug-related psoriasis were assessed in large-cohort studies or case–control studies.
Pathophysiological mechanisms of drug-related psoriasis
The underlying mechanisms leading to drug-induced or drug-aggravated psoriasis are mostly incompletely understood. For some medications such as lithium, beta-blockers, and imiquimod, a direct drug effect is suspected.17,18 Alternatively, indirect mechanisms are sometimes implicated via a Koebner phenomenon, eg, in case of a drug hypersensitivity reaction, allergic reaction, irritant reaction, and phototoxicity.12,19
Several drugs have a well-described mode of action by which they can induce the development of psoriasis. Such mechanistic insights have helped to eludicate the pathophysiological pathways underlying psoriasis. One example is interferon-alpha, which plays an important role in the initiation of psoriasis. In psoriatic skin, activated plasmacytoid dendritic cells produce type I interferons, such as interferon-alpha, which in turn triggers a cascade leading to proinflammatory cytokine production.20 Similarly, exogenously administered interferon-alpha is able to induce Th1- and Th17-mediaded cutaneous inflammation.21
Closely related to the role of interferon-alpha in psoriasis development is imiquimod. Imiquimod is a topical toll-like receptor (TLR) 7 agonist that can activate cutaneous plasmacytoid dendritic cells to produce interferons.18 In psoriasis, self-nucleic acids bound to antimicrobial peptides such as LL37 can engage TLRs, which in turn initiate TLR-mediated proinflammatory responses, such as activation of plasmacytoid dendritic cells.3 In line, an imiquimod-induced psoriasis mouse model is used to study psoriasis.22
Clinical features of drug-induced psoriasis
The clinical spectrum of drug-related psoriasis is as diverse as “typical” nondrug-related psoriasis itself.5 Morphological types that have been described as drug reaction included plaque psoriatic skin lesions, palmoplantar psoriasis, nail psoriasis, scalp psoriasis leading to alopecia, pustular psoriasis, and erythrodermic psoriasis. Furthermore, transformative drug-reactions have been described, eg, pustular psoriasis induction in a patient with a personal history of plaque psoriasis. There are no clear specific psoriasis phenotypes provoked by the different drugs implicated in drug-related psoriasis.
There are no clear clinical criteria to distinguish the morphology of drug-induced psoriasis to that of typical psoriasis. However, in some cases, so-called psoriasiform skin lesions are described.23 Clinically, such skin lesions are almost similar to classic psoriasis cases but lack certain characteristics of psoriasis. For instance, psoriasiform skin lesions may miss well-demarcated borders or lack the coarse scaling typical of psoriasis.
The severity of drug-related psoriasis can vary considerable. There have been documented cases of generalized psoriasis and erythrodermic psoriasis, requiring hospitalization for proper management.19,24
Histopathological features of drug-induced psoriasis
There are few systematic studies on the histopathology of drug-induced psoriasis. In most cases, the histopathology of a drug-induced psoriasis is virtually indistinguishable from that of conventional psoriasis. However, drug-induced psoriasis often lacks tortuous papillary dermal capillaries and associated suprapapillary epidermal thinning, which may be used as differential criterion.25 Furthermore, the number of Munro micro-abscesses and macrophages may be low in drug-related psoriasis.5 Additional histological clues to diagnose a potential drug-induced psoriasis include an eosinophilic infiltrate in the dermis and a lichenoid pattern.19,25,26 Importantly, however, absence of these histopathological findings does not exclude the possibility of a drug-related psoriasis.
Management of drug-induced psoriasis
The first step in the management of drug-related psoriasis is stopping and replacing the offending agent when possible. However, the psoriasis skin lesions may show no to minimal improvement upon treatment discontinuation of the suspected drug. When additional skin-directed therapy is needed, the treatment options that are normally available for psoriasis can be initiated. These options include topical treatments with corticosteroids and/or vitamin D analogs, ultraviolet-based phototherapy and systemic treatments, such as methotrexate, acitretin, and fumaric acid esters, and biologics.27 Cases have been reported in which systemic treatment with methotrexate or cyclosporine was needed to sufficiently control drug-induced psoriasis.19,28
Specific drug associations linked to psoriasis
The list of drugs that have associations with drug-related psoriasis is quite extensive. For most drugs, however, the evidence is limited to anecdotal reports. Consequently, there are often insufficient grounds to clearly define the risk of a particular drug in context of its psoriasis induction of exacerbation potential. Traditionally, there have been strong associations documented for beta-blockers, lithium, synthetic antimalarial drugs, interferons, imiquimod, and terbinafine (Table 3). Of note, most of these associations stem from the 1970s and 1980s, in particular for lithium and synthetic antimalarial drugs.
Table 3 Overview of selected traditional and newly reported drug-associations linked to either induction or exacerbation of psoriasis
Traditionally reported drug-associations
Beta-blockers, also known as beta-adrenergic receptor antagonists, have been among the drugs most strongly linked to plaque psoriasis exacerbation. It is noted that the lag time to onset of psoriasis development can take up to 12 months.11 Oral beta-blocker use has been anecdotally implicated in erythrodermic psoriasis19,29 and palmoplantar pustular psoriasis.28 Topical beta-blocking agents, used for the treatment of glaucoma, have been reported to elicit psoriatic nail changes.30 In pediatric dermatology, oral beta-blocking agents are prescribed for the treatment of infantile hemangiomas. There is a single case of the development of psoriasiform diaper rash linked to treatment with oral propranolol in an 18-month-old girl.31 While there are convincing individual case reports on the association between beta-blocker use and psoriasis provocation, epidemiological studies yielded conflicting results.32 A large US prospective cohort study using data from the US Nurses’ Health Study reported long-term regular beta-blocker use for ≥6 years to be statistically significantly associated with an increased risk for psoriasis (HR, 1.39; 95% CI, 1.11–1.73).33
Lithium, which is prescribed for manic depressive disorders, has been associated with an increased risk for psoriasis development. The first report of psoriasis exacerbation linked to lithium use dates from the 1970s.34 Cases on psoriasis induction and psoriasis exacerbation due to lithium have been reported, but lithium seems to cause predominantly exacerbations.5,7 Lithium-related psoriasis flares may respond favorable to oral supplementation with inositol.17 In a case–control study using UK-based general practice data, long-term lithium use was associated with an increased risk for incident psoriasis (odds ratio 1.68, 95% CI 1.18–2.39).35 Psoriasis types linked to lithium include plaque type psoriasis, pustular psoriasis, palmoplantar psoriasis, and psoriatic arthritis.15,36 The mean time between start of lithium and onset of psoriasis exacerbations is ~20 weeks, while time to induction of psoriasis is estimated to be 48 weeks.11,15
Antimalarial drugs: chloroquine and hydroxychloroquine
The synthetic antimalarial drugs chloroquine and hydroxychloroquine are associated with plaque type psoriasis exacerbations.5 There have been several descriptions of worsening of psoriasis in individuals receiving antimalarial prophylaxis.37,38 Furthermore, there have been cases reported of psoriasis exacerbation with the use of hydroxychloroquine as immunomodulating treatment for lichen planopilaris and psoriatic arthritis.39 Rarely, these antimalarial drugs are linked to induction of psoriasis.40 The latency period of psoriasis exacerbation is usually between 4 and 12 weeks.11 Morphological variants of (hydroxy)-chloroquine-related psoriasis other than plaque type psoriasis include pustular psoriasis and erythroderma.41–43 The exact risk of psoriasis exacerbation or induction related to antimalarial drugs remains unknown.44
The TLR7 agonist imiquimod is used as topical treatment for various indications including (pre)-malignant skin lesions. Imiquimod treatment can lead to psoriasis exacerbation in adult individuals already diagnosed with psoriasis.18 Imiquimod has been linked also to drug-related psoriasis in children, who had been treated off-label for molluscum contagiosum or verrucae.45 Most cases describe plaque-type psoriasis as reaction to imiquimod. One case described the development of psoriatic erythroderma following topical imiquimod treatment for actinic keratosis; in this case, infliximab treatment was needed to achieve sufficient disease control.26
Interferons have a well-known association with psoriasis development. Different interferons have been described in relation with induction of psoriasis, including interferon-alpha, interferon-beta, and interferon-gamma.
Interferon-alpha treatment is used for multiple indications, including hepatitis B or C infection, Kaposi sarcoma, and various malignancies, such as renal cell carcinoma and metastatic melanoma. Psoriasis has been described predominantly in patients with hepatitis C21,46,47 but also infrequently in patients with melanoma,48 leukemia,49,50 Kaposi sarcoma, and renal cell carcinoma.51 Of note, both cutaneous and – more rarely – psoriatic arthritis have been linked to interferon-alpha treatment.51
Treatment with interferon-beta is indicated for multiple sclerosis. Both exacerbation and induction of psoriasis have been described in patients with multiple sclerosis treated with interferon-beta.52–54
Another drug that is commonly linked to an increased risk for psoriasis is terbinafine, a synthetic antifungal agent.57–59 Terbinafine is described in relation with both exacerbation and induction of psoriasis.60 Morphological psoriasis variants triggered by terbinafine treatment include plaque type psoriasis, (generalized) pustular psoriasis, and inverse psoriasis.60–63
Novel reported drug associations
Monoclonal antibody-based antagonists of TNF-alpha are in use for a variety of immune-mediated inflammatory diseases, such as Crohn’s disease, rheumatoid arthritis, and psoriasis. Surprisingly, use of TNF-alpha inhibitors is associated with a risk of developing psoriasiform adverse events. The development of this so-called paradoxal psoriasis – given that TNF-alpha antagonists are applied as biological treatment for psoriasis – is well-documented for nondermatological indications of anti-TNF-alpha antagonism, such as inflammatory bowel disease and rheumatoid arthritis. Morphological psoriasis variants induced by TNF-alpha antagonists include plaque type psoriasis, pustular psoriasis, guttate psoriasis, scalp psoriasis, and palmoplantar psoriasis.64
A systematic review published in 2017 analyzed 216 cases of new-onset psoriasis induced by TNF-alpha inhibitor use for Crohn’s disease (41% of cases), rheumatoid arthritis (37%), and ankylosing spondylitis (14%).65 The prevalence of anti-TNF-induced psoriasis in inflammatory bowel disease is ~2%.66 The majority of cases had onset of psoriasis development within the first year of treatment with the TNF-alpha inhibitor. Female sex and smoking were more frequently associated with TNF-alpha inhibitor-induced psoriasis.66,67 A previous retrospective cohort study in inflammatory bowel disease patients also reported smoking as an important predictor for anti-TNF-alpha-induced psoriasis.68 Most cases of anti-TNF-alpha-induced psoriasis are linked to infliximab, with fewer cases described with adalimumab, certolizumab, and etanercept.67
The mechanisms underlying “paradoxical” psoriasis due to TNF-alpha antagonists are incompletely understood. The proinflammatory cytokine interferon-alpha produced by plasmacytoid dendritic cells might be implicated.64,69
Most patients with anti-TNF-alpha-induced psoriasis can be managed with topical corticosteroids, but switching to a different TNF-alpha blocker or to a biologic with a different treatment target may prove helpful.70 However, in ~50% of the cases, the psoriasis will recur following treatment switch.66
The anti-PD1 drugs nivolumab and pembrolizumab are immune checkpoint inhibitors that are used in oncology. Recognized side effects include immune-mediated toxicity, such as the development of psoriasis.71 Both psoriasis exacerbation and induction of de novo psoriasis have been reported.72
Other monoclonal antibodies
There have been several case reports reported on anecdotal associations of psoriasis with specific monoclonal antibodies. Examples include vedolizumab (α4β7-integrin antagonist)73 and rituximab (CD20 antagonist).74–77
VEGF antagonists such as sorafenib, a small molecule inhibitor, have been reported in case reports and case series of psoriasis induction and exacerbation. Yiu et al78 reviewed three cases of sorafenib-induced psoriasis and four cases of sorafenib-exacerbated psoriasis. The association between sorafenib and psoriasis is considered paradoxal, given that VEFG inhibition is a potential treatment target for psoriasis.79 There have been several clinical cases reporting of complete psoriasis clearance in oncological patients treated with sorafenib.79,80
Bupropion is a nicotin receptor antagonist that is prescribed in smoking cessation aid. There have been several recent case reports on bupropion-associated psoriasis and cases of erythrodermic pustular psoriasis requiring in-hospital treatment.24,81–83
Exposure to certain medications can either induce or exacerbate psoriasis. However, the associations between specific drugs and psoriasis development have not been studied systematically. The available evidence is limited predominantly to anecdotal single-case reports or retrospective case series. Traditionally, drugs that are strongly implicated in psoriasis include beta-blockers, lithium, synthetic antimalarial drugs, and imiquimod. More recent associations have been reported for targeted treatments using monoclonal antibodies or small molecules that are used in oncology and immunology. Examples include TNF-alpha inhibitors such as infliximab and anti-PD1 immune check point inhibitors such as nivolumab. Clinicians should be aware of potential associations, but currently a practice gap exists in the recognition and management of drug-related psoriasis. The first step in resolving a drug-related case of psoriasis is recognizing a potential offending drug from the patients’ medication list. Using the Naranjo adverse drug reaction probability scale may further help in the quantification of a potential link. Suspected medications may be discontinued and switched to an alternative medication when possible, while the psoriasis should be treated according to standard guidelines. Increased clinical awareness for medication-related causes of psoriasis induction or exacerbation should result in earlier recognition and treatment, which ultimately would lead to a better management in psoriasis treatment.
The authors report no conflicts of interest in this work.
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