There are many reasons that cause black spots on the genitals of boys, which may be caused by circumcision and glansitis, and may also be caused by excessive sex life, hyperpigmentation, etc., and should be treated reasonably according to the actual situation. 1. glans penis: if the male genitals due to infection or trauma stimulation and other reasons, resulting in glans penis, it will make the glans appear bruises and other conditions, the localization can be manifested in black spots. Daily attention should be paid to keep the genitals clean and hygienic, avoid external stimulation, can be used under the guidance of the doctor Itraconazole, erythromycin ointment and other drugs treatment. 2. Excessive sex life: If you don’t maintain a good sex life routine, resulting in excessive sex life, it will make the local skin damaged, rough, bruised, and there will be black spots on the genitals. It is recommended to keep a good sex life routine or not to have sex for the time being. 3. Pigmentation: Boys’ genital skin, like other parts of the skin, is prone to hyperpigmentation and shows black moles, which is a common phenomenon. If it is not accompanied by pain and itching and other symptoms do not need special treatment, daily attention to rest, keep the genital skin clean. If there are black spots on the genitals of boys and accompanied by other discomforts, they should go to the hospital for examination to determine the cause of the disease and then be treated under the guidance of the doctor.