A pimple in the hair may be folliculitis, sebaceous nevus, common warts and other diseases, which need to be treated with medication, physical therapy and surgery for the cause. 1. Folliculitis: it is often characterized by red papules, pustules, pain, etc. It is common in the scalp, face and other places. If the folliculitis is mild, it can subside by itself. But folliculitis is more serious need to follow the doctor’s advice to use povidone-iodine solution, povidone-iodine solution and other antibacterial lotion. For bacterial infections, topical antibiotics such as mupirocin cream and fusidic acid cream should be used as prescribed by the doctor. If it is a fungal infection, you need to follow the doctor’s instructions to apply econazole cream, terbinafine cream and other antifungal drugs, and if necessary, need to take oral medication. At the same time, infrared irradiation and laser can be combined for auxiliary treatment. 2. Sebaceous nevus: generally manifested as the presence of smooth surface elevated plaque on the scalp or face, which can be regarded as flesh bumps by touch. Patients need to cooperate with the doctor to take laser, electrocautery and other physical therapy, if there is the possibility of malignant transformation, then need to take surgical treatment. 3. common warts: the main manifestation of the affected area has solid pimples, occasional pressure and pain, and will continue to increase. Patients need to use 5%~20% salicylic acid topically under the guidance of the doctor, as well as retinoids such as retinoic acid cream and tazarotene gel, and immunomodulators such as 5% imiquimod cream. At the same time, physical therapy such as cryotherapy, photodynamic therapy, and warmth can be used. For patients with a small number of lesions, shaving or excision may be considered. Patients with a fleshy bump in the hair need to go to the hospital, complete the examination, and cooperate with the doctor to actively treat the primary disease.