So a few years ago I noticed a white spot on my tear line, I thought at first it was a sty, but it didn't itch or go away, then I thought as it got a little bigger that it was a zit, but it never went away. It was there for about four years, then one day, the white spot fell off, leaving an obvious "crater" it started to hurt like a bruise and got worse for a few days and then one day it swelled and was very tender to touch. I looked at it in the mirror and noticed a bulge in it, I applied some pressure to it and some pus and a "thing" came out. The "thing" was round, but not like a ball, like a disc, but it was filled with liquid, so when I squeezed it between my fingers (free of my eye) it popped. what is this thing and why did it last so long and is it over?