I have a series (groups) of small (up to 3/16 inch) blisters on my right forearm right wrist,and (center of ) right palm (never had had any trouble in this area before). They are very itchy although application of hydrocortisone cream relives this symptom to a considerable degree. Resembles poison ivy but I don t think it s present in my area. I believe insect bites (possibly fire ants) could be a cause but I doubt it because I have always noticed the sting of the bite - not in this case.