PLEASE READ! THIS IS A CRISs!?

My ferret named Catieloua just turned 14 and he has signs of Blackheads acne! When I fist saw him this morning I noticed some bare spots with oozing zits. He had been outside for the night I imagined, because we have a ferret-door installed. I also noticed that one of his paws was all shriveled up, like a rotten shitake mushroom, and it was pitch black as night! Then his mouth started foaming, and I nervously started popping his zits with a needle I use to season raw chicken. Soon his zits tuned inside out and I could see his rotten flesh. I am really worried about Catieloua. Any ideas about what this could be?