I don’t know what this is and it’s on my shaft

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i need someone to please tell me what this is its kinda stiff and a little senstive iv had it for 2-4 days

looks like a large boil or pimple
try putting hot packs on it
avoid masturbating or sex until it heels

Are you sexually active, when was the last time you had unprotected sex (vaginal, anal, or oral)?