I recommend going to a hand specialist. They can tell you if it's osteo, rheumatoid, carpal tunnel, tendonitis or something else and properly treat it.
I had a ganglion cyst removed, it was done in the doctor's sterile room, took about 2 weeks to heal and no more lump or pain. Again this is somthing you need a doctor to diagnose.
I thank God for the doctor I see now, the previous one never listened to what I was saying and blamed all my ailments on age. I think I could have dropped dead in front of him and he would have said it was an age thing (I was in my 40's at that time I hate to think what he said to patients in their 60's or 70's).
Longarm