A hard bump on the head is usually considered to be a boil, neurofibroma, hair root sheath cyst and other diseases. Patients are advised to consult a dermatologist in a timely manner to clarify the specific cause through examination, and then undergo medication, physical therapy or even surgery according to the cause. Common causes and treatments: 1. Boils: Inflammatory nodules or abscesses caused by pathogenic bacteria infecting hair follicles and their surrounding tissues, with local redness, swelling, heat and pain, and increased pain when pressed. It can be treated with topical polymyxin B ointment, mupirocin ointment and oral macrolides, and if necessary, incision and drainage of pus. 2. neurofibroma: this disease is an autosomal dominant disease, mainly manifested as round, nodular or spindle-shaped bumps, which can be soft or hard, and can be treated by radiotherapy and surgery. 3. hair root sheath cyst: this disease is found on the scalp, face and other places. The swelling is difficult to push, the surface is smooth, and it can be single or multiple. Hair root sheath cysts are benign lesions, generally do not need treatment, if necessary, with the help of carbon dioxide laser, surgical excision and other ways to treat. Caution: Patients with a hard bump on the head should pay attention not to pick and scratch with their hands to avoid secondary infection after skin breakage. During the treatment period, try to avoid eating spicy, stimulating, cold, greasy food, so as not to increase the size of the hard pack and make the symptoms worse.