Methotrexate Cutaneous Toxicity following a Single Dose of 10 mg in a Case of Chronic Plaque Psoriasis: A Possible Idiosyncratic Reaction.

Low-dose methotrexate is a well-tolerated and inexpensive systemic immunosuppressive agent used commonly in dermatology. However, several adverse events such as pancytopenia, pneumonitis, mucositis, and cutaneous ulcerations may develop during acute toxicity with dose.dependent or idiosyncratic mechanisms. Risk factors for methotrexate toxicity include advanced age, hypoalbuminemia, renal dysfunction, and concomitant drugs increasing the level of methotrexate in the body. We present a case of methotrexate toxicity presenting with classical features along with mucocutaneous side-effects, such as ulceration of psoriatic plaques and acral erythema, following a single dose of methotrexate. [ABSTRACT FROM AUTHOR]

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