I could be way off base, but just a thought. Each summer I get some type of heat rash on my hands that causes me to scratch to the point of breaking skin sometimes. I get tiny blister looking things usually along the edges of my hands and fingers that itches like hell. I usually just use lotion with aloe in it, and that temporarily chills it out.
Then it goes away...until the next summer.
Just thought I'd mention this since it is summertime.