Small black spots on the penis may be caused by pigmentation spots, local ischemia and glansitis. 1. Pigmentation spots: with age, the local skin will become darker and darker, leading to hyperpigmentation and the formation of black spots. If there are no obvious discomfort symptoms, most of them are considered pigmented spots. 2. Local ischemia: for example, habits such as excessive frequent sex life and frequent masturbation, the foreskin is stuck in the coronary groove during erection, resulting in insufficient local blood supply, and small black spots may appear. 3. glans inflammation: especially in male patients with long foreskin and phimosis, due to repeated attacks of inflammation bacterial inflammation constantly causes irritation to the glans, which can gradually form black spots on the glans area. If the small black spots on the penis increase rapidly and are accompanied by symptoms of redness, swelling, heat and pain, it is recommended that patients should go to the hospital in time.