Sorry if this is totally off base - But do your hands physically get hot or cold, too?
My hands, for years, were ice ice cold, then they turned fire hot - Both in the literal sense - And also were in dire tingling pain. Never got it checked out, though.. And it seems to have just gone away with time.. Rare occassion to happen now.
I also had/have Exzema, which causes rashes and bumps to spread across my left ring and middle finger, and has left a hard flat 'scar' on my palm. It also peeled off fairly easily, though pussed and sometimes bled.
Terrible what our bodies do to itself.