The redness and pain of the glans is considered to be related to factors such as inadequate cleaning, glansitis and allergy. 1. Cleaning is not in place: the glans is susceptible to bacterial infection, which in turn leads to the phenomenon of a reddened glans and pain, and itching and other symptoms. 2. glans inflammation: generally due to inflammation around the glans lead to stimulation, so that the glans appears congestion, redness and swelling, which causes the glans to have a piece of redness and pain, and there will be erythema edema, pain and other symptoms. 3. Allergy: it may be due to contact with allergens around the glans will stimulate the skin around the glans, resulting in the phenomenon of glans with a redness and pain, and swelling and other symptoms. If the phenomenon of glans has a piece of redness and pain, it may also be related to the circumcision and other factors, you can go to the hospital in time for examination to clarify the cause of the disease, and then consult the doctor in a timely manner.