When the situation of white face and black forehead occurs, it needs to be combined with its own habits, other symptoms and signs of the whole body to make a comprehensive judgment. Black forehead in the clinical can be divided into physiological and pathological two cases. A, physiological reasons: 1, cleaning is not in place: daily wash face cleaning face only focus on the middle of the face skin cleaning, forehead or chin cleaning is not in place, long-term down can cause the forehead skin than the rest of the face skin black, develop good cleaning habits, can reasonably use cleaning products, improve the symptoms; 2, ultraviolet radiation: forehead long-term exposure to the sun, by ultraviolet Irradiation, prompting the skin melanin generation, resulting in forehead skin black, at this time, daily sun protection measures, forehead skin color can also be slowly restored. Second, pathological reasons: 1, endocrine disorders: the usual bad habits and unhealthy eating habits, such as long-term late night, sleep irregularities, often eat sweets, fried food, spicy stimulating food food, etc., causing endocrine disorders, may lead to forehead local skin acne and other inflammatory reactions, resulting in post-inflammatory hyperpigmentation; 2, liver abnormal function: liver function abnormalities caused by hepatitis can also appear forehead skin darkening symptoms, if forehead darkening is more obvious, or suddenly appeared recently, accompanied by general weakness, right upper abdominal discomfort and other symptoms, you need to promptly go to the hospital for liver function examination and clear diagnosis.