Eosinophilic pustular folliculitis with underlying mantle cell lymphoma.

Eosinophilic pustular folliculitis (EPF) is a noninfectious condition characterized by folliculocentric papules, pustules, and plaques on the head, trunk, and extremities. Three subtypes of EPF have been described. Histopathology predominantly shows abundant eosinophils concentrated at the follicle, and treatment typically consists of topical corticosteroids or oral indomethacin. We present an unusual case of EPF in a 52-year-old man that preceded the diagnosis of mantle cell lymphoma.