A blow to the testicle will normally cause severe pain. The main symptoms are bloody urine and trouble passing urine. It can be injured by a kick to the groin or a straddle injury. The urethra passes through the entire penis. Most parents will want a doctor to help with removal. The foreskin or skin on the penis can get caught on a zipper. All the common skin injuries can occur here. In young boys, the scrotum is injured more often than the penis. Injuries to the male genital area (scrotum or penis).