The ganglion cyst has come back in the wrist still small but very sore. 5-6 pain scale. could it be pressin on muscle. do i call pcp?

Yes: Ganglion cysts that are painful and enlarging should be seen by your md.Most common location is the wrist and can be painful from tendon irritation or being " pinched" in the joint w/ motion. An ors can excise if pain continues.Needle aspiration/ injection can provide temporary( usually) relief.

Synovial fluid: Fills ganglion cysts. These cysts are fluid filled sacs and synovial fluid is what lubricates the joint, fluid enters the cyst through a tiny attachment from the joint and makes the cyst large . This is why activity or force seemingly makes the ganglion larger as more pressure in the joint leaks into the cyst. Typically it's a like one way valve into the cyst but they can drain back spontaneously.