I have tiny ant bite looking blisters on 3 of my fingers on each hand, what could they be?

Dyshidrotic eczema: If they are recurrent, itchy, and along the sides of the fingers dyshidrotic eczema may be a possibility. A strong prescription topical steroid would clear them up quickly. Really good thick moisturizer will help also, like petroleum jelly at bedtime.

Blisters: Too many choices to list here. You will have to be seen by your PCP or a Dermatologist to evaluate the vesicles.