The erythema without secretion on the glans after masturbation is considered to be related to glansitis, local allergy, eczema and other factors. 1. glansitis: if you don’t pay attention to cleanliness and hygiene during masturbation, the glans is infected by fungus and bacteria and induced glansitis, then there will be red spots on the glans with no secretion. 2. Local allergy: if you use some stimulating cleaning solution or use some kind of drugs to clean the glans, causing local allergy to the glans, there will be red spots on the glans without secretion. 3. Eczema: glans eczema and glans area do not pay attention to clean, glans by the friction of underwear, eat some allergic food and other factors related to glans eczema, glans eczema main symptoms for the glans localized red pimples, erythema, no secretion, and accompanied by itching symptoms. There may be other reasons for the erythema on the glans after masturbation, in which case the patient should prohibit masturbation to avoid aggravating the condition. It is recommended that patients go to regular hospitals for standardized treatment in a timely manner, and do not abuse medication on their own.