What to do if i have a ganglion cyst on the top of my wrist and it's painful. i went to theelse had had this problem with a cyst?

Ganglion cyst: Sounds like a ganglion cyst: a benign cyst that communicates with the wrist joint. These can be surgically removed but have a rather high rate of recurrence and sometimes disappear spontaneously. See a hand surgeon for a precise diagnosis.

Dorsal Carpal Gangli: Carpal ganglions are a frequent cause of wrist pain but you should have it evaluated by a Hand Surgeon because extensor tenosynovitis and other issues can mimic it. Do not hit it with a book! I've seen patients who have fractured their wrists trying this home remedy. Aspiration/injection or excision is the way to go if these are painful.