Kaposi's sarcoma (KS) is a disease in which cancer cells are found in the tissues under the skin or mucous membranes that line the mouth, nose, and anus.

KS causes red or purple patches (lesions) on the skin and/or mucous membranes and spreads to other organs in the body, such as the lungs, liver, or intestinal tract.

Kaposi's sarcoma consists of characteristic skin lesions that range from flat to raised purple plaques. These tumors have a rich network of small blood vessels, and red blood cells...