[Generalized pustulosis after leflunomide].

Leflunomide is a an isoxazole derivative used as an immunosuppressive drug in rheumatoid arthritis and psoriatic arthritis. It is a pyrimidine synthesis inhibitor that has an inhibiting effect of tumor necrosis factor alpha (TNF α) signaling. We present a case of with generalized pustular skin lesions after intake of leflunomide, which resemble a pustular exacerbation of a pre-existing psoriasis as well as a generalized pustular psoriasis.