What Causes A Small Bump On The Thumb?
Tenosynovitis/ganglion or synovial
Detailed Answer:
Hi.
Thanks for your, and an elucidate history and clear pictures.
To recapitulate: Female/55 - noted the Medical History, the Medications and family history - bump as explained by you and well depicted in the pictures you have provided ...
From the history and the pictures this lump looks to be a small ganglion or a synovial cyst.
The ganglion is arising from the lining of the tendons and the synovial cyst appears from synovium that is lining of the joint.
Both the conditions are benign and do not cause any harm as such.
Even if this is aspirated it will refill soon.
I hope this answer helps you, please feel free to ask for further relevant queries if you feel that there is a gap of communication.