hiya, i have a problem with my dickhead, a small patch of my penis changed brown, i mean it looked like a scar then it started cracking leaving a dead skin, its not painful but when you press it , it has some pain from inside, it has been there for a whlie about 3 months now, seen a physician gave me some antibiotics jabs but nothing is working. its now spreading , i havent had intercourse since jan .What could it be ? kindly advise