Classic Kaposi's sarcoma is a type of cancer that primarily affects the skin and mucous membranes. It is characterized by the development of purple, red, or brown lesions that can appear on the legs, feet, or face. This form of Kaposi's sarcoma is often associated with older adults, particularly men of Mediterranean or Jewish descent. The disease is linked to the human herpesvirus 8 (HHV-8), which is believed to play a role in its development. Classic Kaposi's sarcoma typically progresses slowly and may not require immediate treatment unless the lesions become painful or affect the patient's quality of life.