Hello, i have developed some sort of skin rash on my hands. They started off as small bumps, turned into blisters and are now huge circles about coin size and some parts are raised and crusted over. There are white lines in the red areas, and it tends to itch sometimes. I had something like this before, and it went away (was not this bad) and my boyfriend ended up getting it..his went away and now i have it again. What could it be?