a few months back, i would masturbate with soap, and even though sometimes it would hurt, i would continue until i ejaculated. now, i have totally stopped this process for i feel that it has injured my penis. i have developped these dark areas around the bottom of the head of my penis and what seems to be an abrasion on the head of the penis itself. when i am errect, sometimes it looks as if the head of the penis is cracking and very dry. can you please tell me if all these signs are from harsh masturbation using soap and if so, what can i do to heal myself?