There are more possible reasons for foreskin edema, the following reasons are common: 1, foreskin infection can occur after foreskin edema with skin redness and local pain. Sometimes the foreskin redness and swelling can obviously affect urination, pain when urinating, need to carry out anti-infection treatment. 2, foreskin embedded can also appear foreskin edema, common in patients with prepuce, the foreskin turned to the coronal groove area can not be returned to the original position, resulting in poor reflux caused by edema, this case need to go to the hospital to reset the embedded foreskin, edema can gradually subside. 3, local extrusion, stimulation, friction The first thing you need to do is to return the foreskin to its original position and rest moderately to restore it to normal.