Children with black spots on the glans are mostly caused by factors such as masturbation, pigmented moles and performance after injury. 1. Masturbation: frequent masturbation is a bad habit, and prolonged masturbation will lead to chronic inflammation of the penis, which will lead to desquamation and localized pigmentation, turning the normal pink or purple color of the glans into localized black spots. 2. Pigmented nevus: endocrine factors, local skin lesions and bacterial or viral infections may lead to the appearance of pigmented nevus, which will be manifested as localized black spots. 3. Performance after injury: if you do not pay attention to penis protection and make it damaged in daily life, black spots will appear due to pigmentation after repairing the damage. It is recommended to find black spots on the glans, it is recommended to consult a doctor in time, after clarifying the cause of the disease, under the guidance of the doctor’s treatment.