Hi Hope this message finds you in good health. I have gone through your complaints and understand your concern. U seem to have a soft tissue swelling or a ligament inflammation that might be causing the pain.it generally occurs due to a simple sprain on the joint. U should get an Xray done to find out the exact cause.an mri should provide more information regarding the soft tissues. another possibilty is of a raised uric acid level that might cause swelling. it can be diagnosed by a blood test done. a callosity in that region might also cause pain. Hot fomentation,analgesics,anti-inflammatory drugs should help. A shot of local steroid injection should be useful. Nothing to worry about. I hope your question has been answered. If you have any follow-up queries,feel free to consult me anytime. Thanks,Take care,God bless.