A thumb caught in a door that is purple and painful needs to be examined and treated as soon as possible in the general surgery, hand and foot surgery or emergency department of a hospital, usually with a physical examination, and x-rays. If a localized fracture is considered, external fixation or surgery is usually required. If there is no fracture and there is only localized tissue bruising, the area can be incised under anesthesia to drain the blood, followed by regular dressing changes. If there is no obvious localized fluid accumulation, cold compresses can be applied first, which are usually required for 1-2 days, and can reduce tissue bleeding, as well as reduce tissue edema and pain. After 1-2 days of cold compresses, it can be changed to hot compresses, which can promote the absorption of hematoma and edema, and also reduce pain, and some patients can also be sprayed with drugs to reduce pain. During the treatment period, patients can not do too strenuous activities, and can not drink alcohol.