Pseudomelanoma of the iris in herpes simplex keratoiritis.

A 37-year-old white man with a long history of recurrent herpetic keratitis presented with a rapidly enlarging pigmented iris lesion. The primary diagnostic concern was that the lesion might be a malignant melanoma. A biopsy of the mass was done and proved it to be a granuloma with granulomatous arteritis and infarction of the iris. In a patient with a history of recurrent ocular inflammation, such a hypersensitivity granuloma should be considered in the differential diagnosis of iris melanoma.