I have a lump in the side of my buttock, fairly deep under skin - can be felt but not seen. Had it for years and years, but last night we noticed for the first time that it seems to have grown substantially. It's about the size of the top joint of my finger. Doesn't hurt at all, I'm completely unaware of it unless it's 'explored' IYSWIM, and it doesn't hurt when pressed either.
Any ideas?