Something about my penis

Patient: I do not know what i have in my penis, it looks like a scar on my skin it is a redish sort of like crust

Symptoms: i do not have any sythom other than the scar it is not very painful but it appears when i masturbate, i have reported 2 times this thing the first one dissapeared in about 3-4 days of no masturbation and now it appeared again in another zone

Doctor: