Kaposi sarcoma presents as red to purplish spots (macules) and raised bumps (papules and nodules). Kaposi sarcoma lesions can also occur internally; in the gut, lungs, genitals and lymphatic system. The exact cause of KS is not entirely understood. Early on, it was thought that KS was a form of cancer. The patches are usually red or purple and are made of cancer cells and blood cells. Transplant-related (or acquired) Kaposi sarcoma develops in people whose immune systems have been suppressed after an organ transplant. Usually a transplant patient must take drugs to prevent the immune system from rejecting the newly transplanted organ. Often, transplant-related KS affects only the skin.
Before the AIDS epidemic, KS usually developed slowly. Treatment for the AIDS virus itself can shrink the lesions. KS is caused by an excessive proliferation of spindle cells thought to have an endothelial cell origin.

Kaposi's sarcoma consists of characteristic skin lesions that range from flat to raised purple plaques. The mixture of red and blue cells gives the KS lesion a characteristic purple color. 

Source: james sameul

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