I am not a doc but my money would be you have a small foreign body in there and your body encapsualted it. I had a similar thing in a finger where a small metal shaving was in my finger...after a while I had a bump and had a little tension when I bent my finger because it was near a knuckle. Had the doc look at it and she cut my finger open and removed it...I watched and it was like a little sac about the size of a pea and in the center was a tiny shard of metal. Healed up fine after that.
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