Male foreskin, glans red, then the possible causes: 1, foreskin and glansitis, can appear foreskin, glans redness and swelling and other performance, accompanied by increased surface secretions or local pain enhanced. It can also be seen in the local performance of systemic allergy, such as oral allergy to drugs that cause systemic allergy, accompanied by redness and swelling of the glans or foreskin, also known as fixed drug rash. The same skin redness and swelling in other parts of the body can be seen as local itchiness, which requires a hospital examination to confirm the diagnosis and, if necessary, anti-allergy treatment. 3, if excessive friction, excessive masturbation and other stimuli can also lead to local redness, generally stop the relevant stimulation after the local redness can be improved, generally not accompanied by erosion, bleeding or secretions.