The skin was ripped off when I took my sock off the first time. I had plasters on it last night to protect it, and managed to peel off a big clump of solid pus and skin.
Just went to take a look and managed to peel even more off.
Got a fancy non-stick plaster on it now that covers most of my heel and feels nicer than my Winnie-The-Pooh plasters (all I could find, very cute but not practical).
Why do my shoes suddenly hate me? I've worn them for years without trouble. This is the second pair that has decided to randomly give me a blister.