Hard pimples on the eyebrow, consider folliculitis caused by not paying attention to hygiene, acne caused by high androgen levels, epidermoid cysts and so on. 1. Folliculitis: If you don’t pay attention to local hygiene, bacteria can infect the hair follicles and cause folliculitis, which may be related to cosmetic irritation, eyebrow repair, etc. Damage to the hair follicles can easily cause bacterial infection and lead to folliculitis. 2. Acne: Acne has many factors, and it is considered to be related to the elevated level of androgens during puberty. When hormone levels rise, sebaceous glands secrete vigorously, and if they can’t be discharged in time, they accumulate in the skin and form acne. In addition, some bad habits can also lead to exuberant secretion of sebum, which can easily cause acne, such as eating greasy food, staying up late, and high mental stress. 3. Epidermoid cysts: After the hair follicle structure is damaged, epithelial cells are implanted to grow under the skin, which will cause epidermal cell hyperplasia in the dermis, and localized limiting aggregation of keratin, forming cysts. This kind of cyst usually has no obvious symptoms, medium hardness, and pain after bacterial infection. Long hard acne on the heart of the eyebrow should be for the cause of the symptomatic treatment, usually pay attention to maintain local cleanliness and hygiene, in the diet to avoid eating high sugar food, can eat more vegetables and fruits, avoid staying up too late and too much mental stress. It is recommended that the patient to the hospital in time, under the guidance of the doctor symptomatic treatment.