A hard growth on the back of the head that hurts when pressed needs to be treated according to the cause, and common causes include trauma and boils. Common causes include trauma, boils, etc. They are usually treated with medication and surgery. 1. Trauma: When the back of the head is traumatized, such as smashed or bumped, it will lead to local skin tissue and bone damage, resulting in the phenomenon of subcutaneous hematoma, which will form a localized hard bag and cause pain when pressed. Cold compresses can be applied within 24 hours and hot compresses can be applied after 48 hours to reduce the swelling. 2. Boils: When the skin on the back of the head is scratched or abraded, bacteria can easily invade the skin from the follicles and boils will occur, mainly manifested as single or multiple red, hemispherical nodules on the skin surface, accompanied by pain, tenderness and other symptoms. Local topical ichthyol ointment, mupirocin ointment, etc. can be used. If the symptoms are serious, oral antibiotic drugs, such as amoxicillin capsules, erythromycin capsules, etc., can be combined. After the inflammation subsides, the persistence of nodules can be surgically removed according to the condition. All of the above drugs have adverse reactions and are recommended to be used under the guidance of a doctor. A hard bag on the back of the head hurts when pressed, and there may be other causes, it is recommended to go to the hospital in time to improve the examination, and give targeted treatment after clarifying the cause.