Mine came about through unfortunate coincidence. First, I suddenly developed a panic disorder. it came out of nowhere and terrifies me to this day, and I still don't know why. But anyway, soon after this I ate a honeydew melon. Apparently, these melons were contaminated with a staph bacteria. Painfully threw up later that night. And soon, the skin ulcers came. I think I counted 40 and its worst, including the huge one on my face.
So as I was jsut trying to get a handle on my panic, i come down with a horrible, painful, scary infection. That's probably what did it.