Kaposi's sarcoma occurring in a dermatome previously involved by herpes zoster.

A 31-year-old black man with a history of intravenous drug abuse developed a mass in his neck, a biopsy of which revealed Kaposi's sarcoma. The patient underwent radiation therapy, and the mass diminished in size. Approximately 2 months later the patient developed a herpes zoster infection in the left T3 distribution. The vesicular eruption resolved, but postherpetic neuralgia remained. Two months after the herpes zoster infection, the patient developed many small nodules in the area of the prior vesicular eruption. Biopsy revealed these nodules to be Kaposi's sarcoma. At this time no other cutaneous lesions were present. We believe that these nodules represent the occurrence of the Koebner phenomenon in a patient with Kaposi's sarcoma and the acquired immunodeficiency syndrome.