The forehead fell a big bag is due to the scalp at the forehead was damaged, the small blood vessels under the scalp appeared broken bleeding, blood accumulation under the scalp or capillary tendon membrane, thus appearing scalp hematoma. The treatment of scalp hematoma is usually cold compress within 24 hours after injury to constrict the small blood vessels under the scalp, reduce bleeding and decrease the volume of the hematoma; after 24 hours after injury, hot compress and mild massage are used to promote the absorption of the hematoma. Scalp hematoma can be completely eliminated after 3-4 weeks. If the scalp hematoma is not eliminated for a long time, greater than 1 month, or if the hematoma infiltrates into the orbit during the absorption process and causes vision loss, puncture and aspiration of the hematoma and pressure bandaging are required, which can eliminate the hematoma.