Close-up of the skin of a person suffering from AIDS (Acquired Immune Deficiency Syndrome), showing the characteristic purple appearance of a skin lesion caused by Kaposi's sarcoma, a vascular cancer hitherto usually only found in elderly patients of Mediterranean or Jewish stock. Kaposi's sarcoma is one of the two most common opportunistic diseases associated with AIDS, but its spread is an uncommon cause of death. Victims are more likely to succumb to Pneumocystis carinii pneumonia, the other most common opportunistic infection in AIDS.