In this case, it is best to move the injured finger first. If you can't move or feel severe pain when you move, you'd better go to the hospital at once. If the pain is not too severe, it means that the bone has not been hurt. You can ice 15 minutes immediately, and then rub the swollen part with safflower oil every day. After 24 hours of injury, you can also use hot compress to help reduce swelling. Black, blue or bruised fingers are caused by internal tissue damage, which will naturally heal if you are not nervous. The most important thing when you are injured is to check the bones and joint ligaments first.
As long as the bones and ligaments are fine, you don't need too much medicine, as long as it can promote blood circulation and remove blood stasis, such as safflower oil and Yunnan Baiyao spray, you don't have to worry about deformation. Muscle injury will not cause finger deformation.