A small bag on the top of the head hurts when you touch it may be due to folliculitis, trauma, tinea capitis and other factors, need to clarify the cause of the symptomatic treatment, usually available medication, if necessary, can be physical therapy. 1. Folliculitis: is due to bacterial infection caused by the hair follicle and its surrounding tissues of the purulent infectious skin disease, the performance of redness, swelling, pain, itching and other symptoms. You can use mupirocin ointment, ichthyolite ointment and other drugs under the guidance of a doctor to apply locally, and take antibiotic drugs such as cefuroxime orally if necessary. 2. Trauma: after scalp impact and other traumatic injuries, subcutaneous hematoma may be formed, with obvious pressure and pain; in most cases, hematoma will be gradually absorbed on its own, and infrared rays, ultrasonic physiotherapy and other physical treatments can be used if necessary, and panax ginseng tablets can also be taken to promote the absorption of hematoma; if the pain persists, it is necessary to be alert to the occurrence of intracranial hematoma, skull fracture and other conditions. 3. Tinea capitis: it is due to dermatophyte infection resulting in scalp itching, alopecia, scaly lesions, etc. Part of tinea capitis will appear lumps, abscesses, pain, pressure and other symptoms. It can be treated with oral itraconazole, topical terbinafine and other antifungal drugs under the guidance of a doctor. A small bag on the top of the head hurts when you touch it may also be due to other factors, it is recommended that patients seek medical attention in a timely manner, standardized treatment under the guidance of a doctor, avoid private medication, so as not to delay the condition.