Anti-TNF-Related Medium-Vessel Vasculitis: A Report of a Rare Adverse Drug Reaction.

Tumor necrosis factor (TNF) inhibitors have significantly improved outcomes for patients with rheumatoid arthritis (RA). However, these biologic agents can lead to rare but serious adverse events, including drug-induced vasculitis. We report a rare case of anti-TNF-induced medium-vessel vasculitis in a 33-year-old female with seronegative RA and a complex medical history. After inadequate responses and adverse effects from previous treatment, the patient was switched to anti-TNF certolizumab pegol. Shortly after initiation, she developed painful, erythematous, and pruritic rashes on her hands and arms. A skin biopsy confirmed medium-vessel vasculitis. The condition improved following the discontinuation of certolizumab and initiation of immunosuppressive therapy with corticosteroids. This case underscores the importance of vigilance for dermatologic adverse effects in patients receiving TNF inhibitors. Vasculitis should be considered as a differential diagnosis when new skin lesions appear during biologic therapy, and management should be initiated accordingly.