Adalimumab-induced lichenoid drug eruption.

Tumor necrosis factor (TNF)-α inhibitors are being widely and increasingly used for the management of a spectrum of rheumatologic diseases that are refractory to conventional disease modifying anti-rheumatic drugs. Various cutaneous side effects have been reported after treatment with TNF-α inhibitors. We present a case report of a 26-year-old male patient who developed a lichenoid drug eruption few months after the initiation of adalimumab for the management of Crohn's disease. We also highlight the clinical and histopathologic differences between lichenoid drug eruptions and idiopathic lichen planus.