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I am posting answer below-
Well, it sounds to be Ganglion cyst, It is noncancerous and fluid-filled lumps.The exact cause is unknown. Usually they are harmless and painless, and don't require any treatment.
If ganglion cyst is painful, and or it's interfering with joint movement, then it should be treated by doctor. As such there is no OTC medication to treat cyst.
First of all you need to use wrist brace or splint to immobilize the area. This will help to release the pressure on your nerves.
You can take OTC Motrin 400mg twice a day.
The only way to treat such cyst is-
Aspiration Or surgical removal.It will not effect your performance of the hand.
Aspiration procedure can be done in your doctor's office.
Here doctor need to puncture the cyst with a needle and then removes the fluid from the base of the cyst with a syringe.
Please start with your primary doctor and get it clinically evaluated.
Hope this helped
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