Black spots on the glans can be considered to be caused by glans mycobacterial infection, glans pigmented nevus, improper use of medication and other reasons. 1. glans mycobacterial infection: not pay attention to personal hygiene caused by glans inflammation, will make the glans area of the skin to form a localized hyperpigmentation, and also accompanied by local edema, erosion, etc., can be relieved by using 2% sodium bicarbonate solution cleaning method. 2. pigmented nevus of glans: when the nevus grows in the glans area, there will be the symptom of black spot, the area of pigmented nevus is small, there is no protruding condition, there is no need to be treated. If the pigmented nevus is obviously higher than the surface of the skin and accompanied by other symptoms, you need to go to a professional hospital. 3. Improper use of medication: prolonged use of some hormonal drugs, the surface of the glans will lead to hyperpigmentation, there will be black spots on the glans. There are more reasons for black spots on the glans, and if you can’t determine the cause of the disease, it is recommended to go to a professional men’s hospital for consultation and treatment in a reasonable way.