Tape the broken finger to an adjacent non-broken finger.
2. Control Swelling
Cool the finger by applying ice that is wrapped in a towel -- don't apply ice directly to the skin; it can cause a burn.
3. Get Help
Call a health care provider or go to a hospital emergency room immediately so the broken finger can be X-rayed and properly set. Without treatment, it may not heal properly and could lead to a permanent deformity.