The causes of swollen foreskin after masturbation are masturbation injury, not paying attention to personal hygiene, long foreskin and so on. 1. Masturbation injury: If the masturbation action is more intense and longer, it may cause damage to the foreskin and infection, which in turn causes edema of the foreskin. 2. Do not pay attention to personal hygiene: young men’s metabolism is more vigorous, the foreskin swelling is easy to appear foreskin scale. If you don’t wash in time it is easy to cause infection, showing the phenomenon of swollen foreskin. Secondly, when you masturbate, the germs on your hands infect the foreskin and may also cause symptoms of swelling. 3. The foreskin is too long: the foreskin is too long in the patient in the masturbation, the foreskin will be constantly upward, caused by the venous return is not smooth, the symptom of edema of the foreskin. The swelling of the foreskin after masturbation may also be caused by other factors, if the foreskin is swollen after masturbation, and the situation continues for a long time, you should consult a doctor in a timely manner and follow the doctor’s instructions to accept the treatment, don’t have a psychological burden, so as not to delay the condition.