The 8-year-old boy penis red, swollen and pus consider circumcision or prepuce urine residue caused by foreskin infection caused by symptoms. 1. circumcision is the natural state of the penis penis head can not be exposed or partially exposed. If you don’t wash often urine residue will have urine scale formation, longer or weakened body resistance will cause phimosis or glansitis, the heaviest will have redness, swelling, pain and pus symptoms. 2. The narrow opening of the foreskin or the adhesion of the inner plate of the foreskin to the head of the penis prevents the foreskin from being turned up, so that the head of the penis cannot be exposed. Some patients because of the narrow opening of the foreskin will also cause difficulty in urination. At this time if the inflammation stimulation can cause local inflammation lead to redness, swelling, pain and pus. The situation of redness, swelling and pus, you need to go to the urology department of the hospital in time to let the doctor specific examination and then active treatment can be, remember not to deal with it at home.