Persistent peripheral eosinophilia and cutaneous non-Hodgkin's lymphoma: a case report and review of the literature.

Peripheral eosinophilia can be the presenting sign in many cutaneous diseases but is often missed as a marker of a serious undiagnosed underlying disease such as atopic dermatitis, urticaria, drug eruption, bullous pemphigoid, inflammatory bowel disease, helminthic infection, Churg-Strauss syndrome, rheumatoid arthritis, or lymphoma. We report a case of non-Hodgkin's lymphoma presenting as persistent eosinophilia with a diffuse nodular cutaneous eruption.