I cut out a large subcutaneous cyst once, after using a very fine hyperdermic needle for insulin injections, to inject lidocaine [anasthetic] into it, then sliced it out with a sterilised broken razor blade. Very deep cuts down both sides of the cyst. Used my fishing hemostats to grip it, whilst slicing. Lots of blood. Then irrigated the wound, and packed it with aquacell ribbon, for a couple of weeks.
Healed up nicely.
Wouldnt recommend it. GP kept fobbing me off, until one day I'd had enough.
*I dont have any medical training, but Im a bit accident prone, and have paid attention as they've repaired me in A&E.