The causes of black spots on the face of boys may be related to freckles, melanosis, pigmented nevus and coffee spots and other diseases. 1. Freckles belong to one kind of pigmentation spots, which are mainly manifested as small black or brown spots on facial skin. The formation of freckles is related to hereditary factors and is also affected by ultraviolet radiation. 2. Melanosis, also known as melanosis, is mainly manifested as diffuse hyperpigmented spots on the skin of face and neck. The cause of melanosis is not only related to the exposure to photosensitive substances, but also may be related to poor quality cosmetics and drugs. 3. Pigmented nevi are divided into congenital and acquired. They can also lead to the appearance of dark spots on the face. 4. Coffee spot, as a kind of birthmark, is a phenomenon caused by abnormal proliferation of skin tissues during development, which is mainly manifested in the clinic as brown or black patches with clear boundaries and various forms. In addition to the above diseases that cause dark spots on the face of men, prolonged exposure to ultraviolet rays can also lead to dark spots on the face, and the specific conditions need to ask the doctor for an interview.