Patients with dark and long spots at the corners of their eyes are generally considered to be caused by pigmentation, which is considered to be caused by a variety of reasons, such as ultraviolet radiation, the use of poor quality or inappropriate cosmetics, skin aging, endocrine disorders and other adverse factors. 1. Prolonged exposure to ultraviolet radiation: If the patient’s skin is exposed to ultraviolet radiation for a long time and sunburn occurs, it will lead to dark spots at the corners of the eyes. 2. Use of poor quality or unsuitable cosmetics: If patients use poor quality cosmetics or cosmetics unsuitable for their skin characteristics for a long time, it may lead to allergic reaction or inflammatory reaction of the skin at the corners of the eyes, resulting in pigmentation of the corners of the eyes, which will show darkening and spotting. 3. Skin aging: with age, the patient’s skin metabolism decreases, and the self-repairing ability of the skin stratum corneum decreases, resulting in pigmentation that is difficult to eliminate, and then there will be darkening and spotting at the corners of the eyes. 4. Endocrine disorders and other adverse factors: If female patients suffer from endocrine disorders, long-term constipation, insomnia, poor mental health, etc., resulting in poor skin condition, the corners of the eyes will also be dark and long spots. It is recommended that patients with black eyes, spots and other discomforts should consult a regular hospital in time to assess their condition and follow the doctor’s instructions for treatment.