it's just skin irritation from the masturbation. get yourself a penis health creme called man1 man oil and use it everyday. not only will it clear up your present issue but it will protect your penis skin going forward. it's an awesome product. made for the penis skin specifically. hope this helps!
i have a small circle on my penis that looks like a scar. i have only been with 1 girl and i was her only sexual partner. have madturbated frequently no itch burn or pain just a flat smooth circle