One possibility is injury to the joint. When there is a capsular injury to a joint in finger, it is best to give the RICE treatment for a few days such as rest, ice application, compression bandage (you can strap the injured finger with the neighboring finger) and elevation (keep hands elevated on a pillow at bed time). You can also take an anti-inflammatory pain killer. Once the injury settles down and there is less pain you have to start physiotherapy. Bend and extend the finger at the joint slowly to a range of motion possible without pain. Slowly increase the range of motion. With time the stiffness will go. You can also consult a sports injury center.
Other possibilities are arthritis-rheumatoid, injury, inflammation of the sac of joint, finger prick, insect bite, allergy or contact dermatitis to something, tendon injury or inflammation, clot in blood vessel, infection of the skin or pulp of the finger etc.
I think you should discuss these possibilities with your doctor. It is difficult to comment beyond this without examining. Take care!
Copyright 1994-2017MedHelp International.All rights reserved. MedHelp is a division of Aptus Health.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.