Acne can be caused by exposure to allergens, or it can be commonly referred to as acne. Acne is a chronic inflammatory disease of the sebaceous glands of the hair follicles. Red pimples are more common on a daily basis. If the pimples are relatively few and can subside on their own, they are usually caused by physiological factors such as poor daily living habits and can be improved by eating a light diet, avoiding late nights, and paying attention to cleanliness. If you have a lot of pimples and they appear repeatedly, it may be caused by pathological factors, which need to be treated for the cause. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. In addition, the daily cleanliness is not in place, sweating too much without timely cleaning, or using strong alkaline soap to wash the face and use other stimulating cosmetics can also trigger red pimples. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. This leads to bacterial infection and redness. In addition, often touching the pimples with your hands, or using towels and washbasins in public places can also lead to cross-infection. 3. Hyperkeratosis at the opening of the hair follicle sebaceous glands: bacteria decompose triglycerides in sebum to produce free fatty acids, which stimulate epithelial hyperplasia and hyperkeratosis at the opening of the hair follicle sebum, resulting in obstruction of the passage and the accumulation of sebum keratin clumps at the hair follicle opening. 4. Free fatty acids stimulate the hair follicle, causing inflammatory skin damage resulting in redness and swelling of acne.