I work in a brewery, where we blend smirnoff ice malted alcoholic beverages. I wear gloves sometimes on my hands, which are just designed to protect them from being cut by glass, they are made of nylon I think, with a rubber kevlar coating on the outside. I could see where the stains on my hands would come from, seeing as how the gloves do absorb liquid and all, but my feet, i'm perplexed, it's worse there. I wear the same socks and shoes as I have been for months, only recently has it cropped up. Some does come off with vigourous scrubbing, and it also stains my nails, which doesn't come off. I don't really have any itching or anything. I do also work with caustic acid, which burns when I come into contact with it, but again, only on my hands do I come into contact with it. Could I be absorbing something and it exudes through my feet?? Strange I know, but thank you again for your help.