Late onset leflunomide-induced cutaneous ulcers in a seronegative arthritis patient: A case report.

The differential diagnosis for chronic cutaneous ulcers is wide. Once the common causes have been excluded, infrequent ones, including drugs, should be considered. We report the case of a 67 year old woman with multiple ulcers not responding to conventional treatment. Multiple investigations including laboratory testing, skin biopsies and tissue cultures were negative. A few cases of leflunomide-induced cutaneous ulcers are reported in the literature. Our patient was on this drug for 12 years. Discontinuation of leflunomide led to ulcers resolution. This is the longest reported time interval between leflunomide initiation and ulceration onset.