The key to removing the ring is reducing the swelling of the finger. This approach requires patience. While the hand remains elevated, push the ring with steady upward pressure until it slides off. If it won't slide off, call your child's physician immediately before the swelling becomes worse. See Puncture Wounds.
Blood collects under a nail AND becomes very painful.
There is any dirt or grime in the wound you can't get out. A crush injury has damaged the skin or fingernail. Your child is not using the finger or toe normally after 1 week. You have other questions or concerns.