Localized redness of the glans is recommended to go to the hospital for relevant examinations to clarify the possible causes. One, glansitis, can appear local redness of the glans, or the formation of erythema-like changes, around which there can be exudation, the boundaries of the erythema are relatively blurred, accompanied by a sense of swelling. In the acute stage, it can be accompanied by pain and surface erosion, which requires anti-infection treatment after diagnosis. Second, long-term circumcision or prepuce, resulting in increased local foreskin scale, chronic stimulation leads to local redness of the glans, accompanied by itching, pain and other symptoms. It is recommended to go to the hospital and maintain local personal hygiene, and if necessary, circumcision treatment. Third, fungal glansitis, can be accompanied by glans redness, itching, white discharge or cheese-like colored discharge, etc.. If there is a fungal infection, antifungal infection treatment is needed and circumcision treatment should be performed if appropriate.