There are many reasons for acne on the forehead: 1. Endocrine factors cause the entire head and face sebaceous glands to secrete oil too vigorously after puberty, and too much androgen secretion. At this time secondary to the infection of bacteria or mites, acne will appear. In addition, acne, pimples, folliculitis, and other problems may also occur after middle age. This means that eating habits and irregular work schedules can also cause acne to appear on the skin. For example, too much food with too many calories, spicy, greasy, and sweet foods will stimulate the skin to become oily. Poor rest, late nights or stressful work, anxiety and tension can also cause the skin to produce too much oil. In the clinic, patients are instructed to adjust their biological clock, eat a light diet, and eat more vegetables and fruits, and this disease will be much better. When it is more serious, the application of oil control drugs with anti-inflammatory, supplement B vitamins, the patient will reach a more ideal state. The reason for the appearance of acne and pimples on the forehead of the skin is that the entire skin is particularly dry, such as seasonal factors, once the winter and spring season, the wind and sand is particularly large, the skin this hyaluronic acid reduced, after the epidermis lost water increased, the skin is in a dry state, the body will compensatory secretion of a lot of oil to moisturize the skin. At this time, if a lot of oil is not discharged smoothly or cosmetics are applied too much, a large number of acne and acne will appear. Therefore, once dry skin occurs, you should promptly use topical moisturizers that do not contain hormones, or skin care products such as face masks. As long as the skin does not appear dry, acne and pimples will be reduced a lot.