There are many reasons for forehead spots, related to age, sun exposure, endocrine disorders and diseases. 1.Age: Age spots, called seborrheic keratosis, are the most common benign epidermal proliferative tumors in the elderly. It appears as one or several light brown flat papules with clear boundaries, and the number gradually increases with age; 2. Sun exposure: when the skin is exposed to strong ultraviolet radiation, it will play a self-protective function and produce a large amount of melanin to resist the invasion of ultraviolet radiation, and pigmentation will leave unsightly pigmentation on the forehead; 3. Endocrine disorders: irregular work and rest due to stressful life and work, as well as female pregnancy will cause Endocrine disorders, increase the abnormal secretion of melanin, deposition in the forehead will appear the phenomenon of long spots; 4, disease factors: if there are chronic gynecological diseases such as adnexitis, pelvic inflammatory disease, cervicitis, or suffering from liver disease, tuberculosis, chronic gastritis, tumor disease and long-term use of contraceptives, etc., can also lead to the phenomenon of black spots on the forehead of patients.