The fastest way to deal with a bruised nail caught in a door is to decompress it. The specific method is to open or cut the bruised part of the nail plate, so that the bruised part of the bruised blood out in time, until the bruised blood is completely eliminated, then use the pressure treatment or pressure bandage method, so that the bruise or local trauma can be timely recovery. At the same time, you need to take some trauma medicine orally, especially some traditional Chinese medicine, such as blood circulation and blood stasis capsule. Some local drugs can be used to promote the absorption of local inflammation, such as topical fusidic acid cream or mucopolysaccharide polysulfate cream.