Acne on the hairline may be related to endocrine, diet, inadequate local cleansing, mental factors and immune abnormalities, and infection by Propionibacterium acnes.
1. Endocrine: when in puberty or menstruation, due to fluctuations in hormone levels, it will stimulate the local follicle sebum secretion increase, if it is not easy to discharge, it will be easy to grow acne.
2. Diet: If you eat too much spicy stimulating, greasy food and sweets, it is also easy to grow acne.
3. Inadequate local cleansing: If the skin in the forehead hairline area is not cleaned properly or the bangs are blocked on the forehead, it will lead to the accumulation of oil and dirt easily, thus blocking the pores, which will easily cause acne.
4. Bacterial infection. Propionibacterium acnes and Staphylococcus epidermidis are the main strains of bacteria in various acne lesions, leading to localized inflammatory reactions that result in acne.
5. Mental factors and immune abnormalities: when staying up late, anxiety and lack of sleep, it will lead to the decline of the body’s immunity, which is also prone to acne.