during masturbation i was rubbing my penis against bed sheet..later i noticed a black spot below the head of my penis.now im finding an abnormal shape of my penis head while erection also..is it a major problem..will u please help me
Sorry, I can’t think of anything that would cause this... unless this spot is actually a blood blister, in that case it would hurt ALOT. If not then my best advice is to get checked or ask a doctor, you can call a hospital and ask to speak with a doc or nurse without going in.