The child’s penis is red and swollen for two reasons: 1, to exclude traumatic factors, such as hematoma caused by trauma, if it is traumatic factors, the first time to the hospital; 2, the most common inflammation, inflammation of the situation is mainly caused by circumcision or bacterial infections caused by the foreskin glans dermatitis. In this case, the first to observe the child is not a circumcision, if there is a circumcision, to the hospital for the operation of the foreskin expansion or circumcision, to lift the underlying causes. If there is no prepuce, you need to turn the foreskin, clean the whole coronal groove, remove the foreskin scale, and then apply mupirocin ointment or gentamycin, erythromycin ointment and so on anti-inflammatory latex ointment, to carry on the anti-infection treatment.