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Probably because you gave a rash, have skin cancer (I can understand if you don't want to show your doctor), have just taken a hot shower, you're sitting in a position that makes all your blood rush to there, or it is an infectous disease no one's ever heard about. Oh, and why may I ask are you asking this?
depends on where, rash or hemorrhoids possibly

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11y ago

What else can I help you with?