The darkening and peeling of the chin may be related to diseases such as solar dermatitis and melioidosis. 1. Solar dermatitis: the patient’s epidermis will appear bright red erythema, then the erythema will become darker in color, and there is a flaking situation, and there may be hyperpigmentation, which is common in the face. The cause of the disease is related to excessive exposure to ultraviolet rays and other factors. 2. Melanosis: mostly related to exposure to photosensitive substances, malnutrition, endocrine disorders and so on. Facial skin is gray-purple grid pigmentation plaque, and covered with dust-like skin debris. The reason for the black skin on the chin is not unique, and it is recommended that patients go to a regular hospital to clarify the cause of the disease.