In the last few days, DH and I have noticed these blisters and a small rash on DD's feet and left thumb. In the last 1.5 weeks, she has gotten very good at crawling and is everywhere around our house (foam mat, carpet, and hardwood). She has also recently mastered pulling herself up on the furniture and cruising.

Does this just look like rubbing from crawling and standing? Or is this what the beginning of HFM disease looks like? Or is it something else entirely?