I have what I am pretty sure is a ganglion cyst on the inside of my wrist. It seemed to come out of nowhere. Doesn't hurt. Probably about 1cm wide.
I know they're not harmful but Dr Google says sometimes there are other cysts that are similar that may need removing, even though they're benign also.
Do I need to see a doctor? Seems like a waste of their time for a minor lump but equally I don't want to miss anything.