I get these small bumps on my fingers, mainly my index fingers, every spring/summer when it gets warm out. It's ilke a rash but they are not red and they sort of cluster together. They don't itch, or really change at all except I get more of them. They only come out when it gets warm again so it can't be an alergic reaction, and it doesn't look like heat rash. It looks like a little colony of tiny wart-like bumps that spread down the lengths of my fingers and only my fingers. I can't figure it out. Does anyone have any ideas?