My boyfriend has something like what you described. When in his hands it is very painful he says it feels like they are biting under his nails. It has eaten apothecary meat out of his hands and both shoulder blades. He is at a point where he feels if he doesn't do something drastic to kill them... they will get him first. Doctor said it was from another country but not sure what. We can't afford blood work just yet so it is a waiting game. Best of luck.