Psoriasiform eruption induced by infliximab

OBJECTIVE: To report a case of psoriasiform eruption induced by infliximab. CASE SUMMARY: A 46-year-old woman with enterocutaneous fistula secondary to Crohn's disease developed pruriginous, erythematous, desquamative plaques on her elbows, knees, hands, and buttocks after receiving the second and third doses of intravenous infliximab. Histologic examination showed a lichenoid pattern. No new cutaneous lesions appeared after cessation of infliximab therapy. DISCUSSION: Several cutaneous reactions secondary to infliximab, a monoclonal antibody against tumor necrosis factor-alfa, have been described. Psoriasiform dermatitis has not been reported as a cutaneous reaction to infliximab, but there have been several previous reports of psoriasiform dermatitis secondary to other drugs. An objective causality assessment revealed that the adverse event was probable. CONCLUSIONS: This is the first report of a clinico-pathologic dissociated pattern of cutaneous reaction showing a histopathologic picture of lichenoid dermatitis resulting from infliximab treatment.