Whether potato chips can reduce swelling and eliminate bruising is based on the severity of the patient’s local swelling and objective analysis, as follows: a. If the patient’s local swelling is mild, accompanied only by local soft tissue damage and edema. At this time, local external application of potato slices can play a role in absorbing water, reducing swelling and resolving stasis. Second, if the patient’s local injury is heavy, accompanied by serious infection, or even local swelling caused by fracture, the simple use of potato slices applied externally can not achieve good water absorption, swelling and bruising effect. Local X-ray examination needs to be improved as soon as possible to assess whether a fracture has occurred. Local infectious lesions should be removed as soon as possible, anti-infection should be strengthened, and a reasonable treatment plan should be formulated in order to achieve the purpose of reducing swelling and stasis.