This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
This can be a ganglion cyst commonly growing from the tendon sheath.
This can be painful on pressing.
This is a benign condition usually.
Another possibility can be a tenosynovial giant cell tumor.
This is also a benign tumor but can grow rapidly causing significant symptoms.
Surgical removal is the best treatment in that case.
You should consult with a hand surgeon for further evaluation.
It was my pleasure to help you today.
If I have answered all your questions, Please rate my response Excellent (click on the 5th star).
Please bookmark my profile for fast, reliable and authentic answers!
This is the link to my profile: