There is a piece of light red on the glans which is sensitive, may be caused by over stimulation, circumcision, allergy and other factors. 1. Overstimulation: men frequently masturbate, the glans area caused by stimulation, may lead to local light red and sensitive, after reasonable rest can be relieved, will not cause too much impact. 2. Pelvic glansitis: men with pelvic glansitis, due to the inflammatory substances on the glans local stimulation, will make the local redness, and more sensitive, accompanied by itching, pain and other symptoms. 3. Allergy: the use of some stimulating toiletries, resulting in localized allergic reaction of the glans, will make the local light red, accompanied by intense itching, and more sensitive. A piece of light red on the glans is more sensitive may also be caused by other factors, if the duration is longer or at the same time there are other abnormalities, it is recommended that patients go to the regular hospital as soon as possible for medical examination and treatment, and strive for early recovery.