The causes of hypermelanosis of glans include genetic factors, glansitis, melanoma, pigmented nevus and other pathological factors. 1. Genetic factors: if the father’s glans has more melanin, then the son’s glans may also have more melanin, which is mainly related to genetic factors. 2. Glans inflammation: due to various factors stimulate the glans to cause glans inflammation, at this time the inflammation factor will stimulate the melanocytes to produce melanin in large quantities, so the melanin is more. 3. Melanoma: when various factors trigger a large number of abnormal melanocyte proliferation, the phenomenon of black glans will also occur. 4. Pigmented nevus: due to genetic, environmental and other factors triggering melanocytes to produce melanin in large quantities, so the glans is black. Finally, the phenomenon of glans melanin, please go to the hospital in time to check, follow the doctor’s instructions for treatment.