Buns in the hair that hurt when touched are generally considered to be related to scalp folliculitis and scalp boils. 1. Scalp folliculitis: manifested as a follicular inflammatory red papules on the scalp, which can be caused by bacterial, fungal and viral infections, some of which may appear as white pustules, and the larger ones may be connected into pieces, which may be accompanied by pain and itching, affecting the growth of hair. 2. Scalp boils: mainly caused by staphylococcus aureus infection leading to acute suppurative inflammation of the scalp hair follicles, the patient is usually manifested as red pea-sized nodules on the scalp, accompanied by pain, swelling, and even yellowish-white pus can appear. If the patient has the symptom of a bag in the hair with pain, it is recommended to go to the dermatology department of the hospital to find out the cause of the disease.