Folliculitis is caused by bacterial infections and generally rarely occurs systemically. In the case of systemic folliculitis, it is necessary to exclude the presence of AIDS, diabetes and other diseases that cause immune deficiency, and it is advisable to improve the relevant tests. Folliculitis occurs in areas with high sebum secretion, such as the forehead and back. It is recommended to avoid spicy and stimulating food, greasy diet and sweet food in daily life, pay attention to skin cleanliness and avoid dampness and sweating to avoid bacterial growth. Some patients may also be related to zinc deficiency and can be properly supplemented with zinc sulfate.