KAPOSI'S SARCOMA - A relatively rare malignant skin tumor that results in multifocal purplish colored papules or plaques that eventually form nodules. Seen most commonly in patients who suffer from AIDS. Approximately 20% of AIDS patients will manifest Kaposi sarcoma. Kaposi's sarcoma lesions vary from pink to dark red, purple or brown, and are often mistaken for insect bites, birthmarks, or bruises. They range in size from a pinhead to the size of a large coin, and frequently continue to develop into thickened bumps and even large tumor growths. There may be one or more lesions, with new ones developing any place on the skin during the course of the illness. Tumors may also occur within the intestines and lungs. Diagnosis may be confirmed with skin biopsy or UGI endoscopy. Radiation therapy, cryotherapy, and chemotherapy have all been used successfully in the treatment of Kaposi's sarcoma.