Idiopathic lymphocytoma cutis: a diagnostic dilemma.

Lymphocytoma cutis, also known as cutaneous B cell pseudolymphoma, represents a spectrum of disease that shares similar clinical and histological features and simulates cutaneous lymphoma clinically and histologically. Clinically it is manifested as asymptomatic, indolent, nodular lesions of different sizes varying between 2 and 5 cm, usually solitary, mainly on exposed area of the body like face and neck. The presence of polymorphous cell infiltrates comprising of T and B lymphocytes, plasma cells, oeosinophils, histiocytes and dendritic cells along with lack of atypical lymphocytes after incisional biopsy support diagnosis of pseudolymphoma. Final diagnosis is made on immunohistochemistry.