There are options such as surgery or draining of the ganglion cyst to make it go away much faster but yes the ganglion cyst will usually go away on it's own without any medical attention.
Treatment options for ganglion cysts are surgery or draining of the ganglion cysts using a needle.
I had a ganglion cyst and it was getting annoying and I hated the look of it so I went to the doctor and they used a needle to drain it off.
It was worth it to go to the doctor to have the ganglion cyst drained and it didn't take very long for them to drain the ganglion cyst and I felt much better afterwards.
But you can usually wait it out and within 12 to 18 months the ganglion cyst should go away on it's own but I didn't want to wait that long.