probably not related, I had several of these abscesses at the very inner top of my leg, and ended up being hospitalised twice - it was only after the second time when I spent about 9 months bleeding/weeping and went back to the Doctor (I know I should have gone earlier, but ....) , it turned out to be a SInus/fistula which I eventually had to have cut out - theres no scientific or medical reason apparently, but if you have one, you do tend to be more prone to recurrences, so worth keeping an eye on it if you get the "twinge" again.