This sounds like an infection of mainly the tip of the penis which is known by the medical name of 'balanitis' The antibiotic he is on should help, but also apply Bactroban ointment to the tip of your son's penis twice daily. If the problem is not better after 48 hours or if your son seems to have difficulty passing urine, he must be seen by a doctor as quite often it may be necessary to do a circumcision to relieve this problem.
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