Hi,
Frequent manipulation of the penis may cause irritation or minor cuts and injuries to the skin. This may herald the start of an infection and even a dermatitis. I suggest you refrain from any sexual activity until you have the lesions assessed. A urinalysis with a complete physical examination may help determine the cause of the lesions as well as rule out a urinary infection.
im only 14 i went swimmin today for a while and while swimmin my penis started to burn alot. every where i turned it hurted. so igot out and look i saw tiny red cut lookin lines and it hurts wen it is toched. plzzzz help me