Hi doctor! I am 23 years old boy I want to ask that when I masturbate my skin of penis becomes red when I do the act for more than 2 minutes, although I rub the penis very slowly and then pain occurs in the skin. It does not occur when I masturbate for less than 2 minutes. I use soap on the penis while masturbating as a lubricant. Please suggest home remedies for my penis skin problem. Top half of my penis is black, it looks that it had burnt when I was young but I don't remember that it had burnt. What I do to clear that black skin. Please suggest home remedies. Please provide the answer separately for both of my queries.