The glans is red for a number of reasons, which may be physiological and pathological, such as eczema, circumcision, glansitis and so on. 1. Physiological reasons: may be clothing friction or non-pathological reasons lead to a red piece of glans, most of them can be recovered on their own, without treatment. 2. Pathological reasons: (1) eczema: may be abnormal immune function and other reasons caused by superficial dermis and epidermal inflammation, resulting in the body of the red spot a little also accompanied by itching and other symptoms. (2) Foreskin glansitis: usually caused by bacteria, fungi and other infections, can cause red spots, accompanied by itching and so on. In addition to the above, a red patch on the glans can also be seen due to allergies and other diseases. When abnormalities of the glans appear, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination and treatment with the help of the doctor.