I have the same problem, the first time i got them when i was 9 years old, I had 7 blisters on my left thigh, at first they looked like mosquito bites and they were so itchy, and they turned into blisters. And
I have several marks in my feet and legs and
right arm, And
everytime I would have blisters I'd feel so sick, I feel like I have a fever and my legs or arms would feel so hot. And when they're about to heal, it gets itchier. I noticed that I'll just have them when it's around Spring-Fall.