The patient’s head knocked a bag, can be treated by ice, heat, infrared physiotherapy, application of drugs, incision and drainage, etc., as follows: 1, ice: through local ice, can promote the contraction of capillaries, reduce local tissue leakage to reduce swelling and pain symptoms. 2, heat, infrared physiotherapy: if the patient is locally injured for more than 24 hours, can be appropriate heat, infrared physiotherapy, improve local blood circulation, can also play a role in reducing local tissue bruising and pain symptoms. 3.Application of drugs: If necessary, you can rub Furtalin ointment or Ruyi Jinhuang ointment, and take oral medications such as Mai Zhi Ling and Diosmin to improve local swelling and pain. 4.Cutting and drainage: Some patients with hematoma formed by local bruises can reduce local pressure by cutting and draining the hematoma. The longer the hematoma lasts, the greater the possibility of infection, so it must be given sufficient attention.