After your hand is purple from a hammer, you should first go to the hospital for an examination to find out if there are any fractures and other serious injuries. If there is, it should be handled by specialized doctors accordingly; if there is no fracture, it should be treated with cold compress, hot compress, medication and debridement. 1. Cold compress treatment: within 24 hours after the hand is smashed by the hammer, ice packs and other items should be used in a timely manner to deal with cold compresses, in order to slow down the blood circulation, inhibit the spread of hematoma, but also to reduce the local swelling and pain. 2. Hot compresses: 24 hours after the hand was smashed by the hammer, should use hot towels and other hot compresses to speed up local blood circulation and tissue metabolism, conducive to the absorption of bruises, accelerate the metabolism of local tissues, to achieve the purpose of reducing swelling as soon as possible. 3. Drug treatment: under the guidance of the doctor, local application of diclofenac diethylamide cream and other drugs to relieve pain; to prevent infection, you can take amoxicillin and other antibiotic treatment. 4. Cleansing treatment: If there is local skin breakage, it should be cleansed in time, bandaged with disinfectant such as iodophor, and changed regularly to reduce the risk of infection, and if necessary, it should be cleansed and sutured. In addition, it is necessary to pay attention to the deformity or motor dysfunction of the fingers, and should consult the doctor in time.