title: Psoriasis induced by infliximab in a patient suffering from Crohn's disease.
abstract: We describe the case of a 30-year-old female with no family history of psoriasis and suffering from Crohn's disease successfully treated with infliximab at the dosage of 5 mg/kg. On the 15th week from the start of therapy, the patient developed a palmoplantar pustular psoriasis, which spread to the arms, trunk and scalp with erythematosquamous plaques. Deeming the dermatitis onset due to the anti-TNF-alpha, we decided to discontinue infliximab, while starting with a topical therapy with emollients and corticosteroids and a systemic therapy with cyclosporine. These treatments achieved a clear improvement of psoriasis after 2 months and a complete regression of skin lesions after 4 months. Several cases have been reported of psoriasis induced by anti-TNF-alpha, which have shown to exert an effective therapeutic action on this disease. The pathogenic mechanism of such a paradoxical effect has not yet been explained, though a number of hypotheses were proposed, among which one of the most intriguing is that the rapid and strong blockade of TNF-alpha could result in an enhancement of INF-alpha activity with consequent induction of psoriasis.
authors.forename: E
authors.initials: E
authors.lastname: Manni
authors.forename: P
authors.initials: P
authors.lastname: Barachini
mesh_terms: D000279:Administration, Cutaneous; D000305:Adrenal Cortex Hormones / Q000008:administration & dosage; D000328:Adult; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage / Q000009:adverse effects*; D000911:Antibodies, Monoclonal / Q000008:administration & dosage / Q000009:adverse effects*; D003424:Crohn Disease / Q000188:drug therapy* / Q000276:immunology; D016572:Cyclosporine / Q000008:administration & dosage; D004643:Emollients / Q000008:administration & dosage; D005260:Female; D005765:Gastrointestinal Agents / Q000008:administration & dosage / Q000009:adverse effects*; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage; D000069285:Infliximab; D007262:Infusions, Intravenous; D011565:Psoriasis / Q000139:chemically induced* / Q000188:drug therapy / Q000473:pathology; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors
chemical_list: D000305:Adrenal Cortex Hormones; D000893:Anti-Inflammatory Agents; D000911:Antibodies, Monoclonal; D004643:Emollients; D005765:Gastrointestinal Agents; D007166:Immunosuppressive Agents; D014409:Tumor Necrosis Factor-alpha; D016572:Cyclosporine; D000069285:Infliximab