Kaposi sarcoma

Key facts Kaposi sarcoma is a type of cancer that affects the lining of your blood and lymphatic vessels. It can cause reddish patches that may be visible on the skin. It is caused by the human herpes virus-8 (HHV-8), though not all people with HHV-8 will develop Kaposi sarcoma. People who have HHV-8 and a weakened immune system are more likely to develop Kaposi sarcoma. Kaposi sarcoma is diagnosed with a biopsy (a sample of tissue that is removed and checked for cancer cells). Treatment will depend on your general health, the health of your immune system, and where