Hi gigi935, Thanks for the question.
Before I can give a reasonable answer, I need to know where this cyst is. HoweverI know of no cyst that can be stopped from growingwith Naproxen Except a ganglion cystover a joint or tendon sheath or a Baker's cyst of the back of the knee, which are due to chronic irritation and inflamation.
I hope this answers your question, if so please click on Accept, if not get back to me with more infoor other questions. Dr. L
Medical Doctor
General Surgeon - 40 years; currently praciticing Adult Medicine