I was once told I got it from taking a medication I was taking for my migraines. I have some of the symptoms that people was telling me about, but not real sure if it's the truth or not. My skin itches for no reason an when I scratch it a blister or blisters show up, is this what it is or maybe something else? When they pop or get busted it is very painful, and leaves a nasty sore. Can someone please help me?