If you're worried go get it checked out... none of us can tell you without seeing it, and most of us couldn't tell you if we did see it.
It could be a ganglion cyst, my mom had one of those and was told she should have surgery to have it removed. Though it's highly unlikely you could have a granuloma but those tend to be something in growing children.
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Horses come and go, but some leave permanent hoof prints on your life.
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