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This being at the knuckle joint and feeling like a firm cyst sounds that it may be a ganglion cyst ..
That is a weak area of the connective tissue surrounding the joint
Fluid within the joint may push out a weak area of the connective tissue that surrounds the joint ...
The othopedic specialist can help you with this ...
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Thank you and Best Regards,
Anthony Bray MD
It may be a sesmoid bone perhaps ...I don't have the benefit to exmine it of course ...
The orthopedic referral is correct for what you describe ..I agree with that ...
It does not sound "fixable" on your own however ...