Brown spots on the glans may be a normal phenomenon, or may be caused by injury, inflammation and infection. 1. Normal phenomenon: brown spots on the glans, but no other clinical symptoms, may be caused by melanin deposition, belonging to a benign pigmented spots, will not have an adverse effect on the health of the reproductive system. 2. Injury: for example, long time pressure or external blow, resulting in local damage, easy to make the local presence of bruises, it is manifested as brown, accompanied by pain, swelling and other symptoms. 3. Inflammatory infections: do not pay attention to the glans hygiene, may be induced by the foreskin glansitis, prolonged stimulation, it will make the glans with brown spots, accompanied by itching, stinging and other symptoms. Brown spots on the glans, excluding normal physiological conditions and the existence of abnormal symptoms, it is recommended to consult a doctor for examination and treatment to avoid adverse effects.