Thanks for all your replies guys!
Quick update… So on further research, pompholyx isn’t contagious so shouldn’t spread from hands to feet. It is very itchy and is a form of eczema. So not that. Possibly hand, foot and mouth, a variation of varicella (chicken pox). No cure, just have to ride it out. Itchy as chicken pox, blisters look typical of it. No mouth ulcers, tho, but a temperature is typical. I was almost 39 degrees the other night. My pharmacist recommended potassium permanganate.