A 69-year-old man presents for his annual check-up. He maintains that he has lived a healthy life, walks up to twenty miles every week, and volunteers in his community. He currently reports no symptoms. On general examination, there is a painless, flat, purple skin lesion on his right lower leg. Histological evaluation from a skin biopsy reveals the lesion to be caused by the human herpesvirus type 8. Which of the following group of diseases is associated with this virus?

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