hi no need to be panic for that ganglion
..usually it arises from soft tissues like tendons,,,
it is a small cyst
like structure containing jelly like fluid...it does not modify into cancer..
very rarely it enlarges in size and due to its pressure on nerves pain wil occur..
and some times it regress on its own...
it is usually treated by simple surgery which requires not more than 10 min..
aspiration also is the treatment but it recurs after some days..
for cosmetic purpose many are undergoing surgery...it does not require orthopedic surgeon..
once again i am telling you that dont be panic for that...
consult any surgeon...