Couple of things: Somewhat common is a ganglion cyst (small collection of concentrated joint fluid). Gouty tophus, or maybe a bone/cartilage cyst, or bone spur can form "nodules" on the thumb area. If it is bothersome to you, i suggest getting evaluated. Good luck.
Answered 11/30/2019
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A doctor has provided 1 answer
A doctor has provided 1 answer
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