A face full of acne overnight is first considered to be caused by skin allergies, while a few patients may have acne outbreaks due to irregular work and rest, mental stress, and improper diet. First of all, think back to the day before the acne breakout whether you have been exposed to allergens, such as hot and cold stimuli, pollen, animal hair, certain metals, cosmetics, etc. These allergens can cause the body to develop an abnormal immune response, which can lead to the appearance of a face full of acne. Patients can be accompanied by varying degrees of itching, stinging, redness and swelling, etc. They should stay away from allergens after clarifying them, and can use medical masks to apply wet compresses, and oral or topical medications under the guidance of a doctor. Secondly, in the acne before too tired, long stay up late, eat a lot of spicy and stimulating food, mental stress, etc., may cause endocrine disorders, which in turn led to sudden burst of acne, this acne is generally acne. At this time you need to change your lifestyle, regular work and rest, avoid staying up late, diet control, avoid spicy and stimulating foods, the face of stress can be adjusted through fitness, listening to music, travel, etc., if necessary, you can also apply medication to treat acne. However, it should be noted that do not squeeze the acne, especially in the face of the danger triangle acne, so as not to cause intracranial infection.