Avoid activities that cause or worsen pain.
After injury, rest the finger joints so that they can heal. Use mild stretching exercises to keep them limber and moving. Stretch the joints gently, not forcefully, twice a day. Stretch just to the point of discomfort, but not enough to cause pain.
Use common sense and do activities that are less stressful to the joints. For example, you can grip a big handle with less strain than a small handle.
Avoid strong pain medicines that tend to mask the pain. You may do too much activity and make the injury worse.
Anti-inflammatory medication can help. Take any prescribed medication for inflammation only as directed.