Hi, welcome to the forum, you are having allergic response to some unknown allergen. The allergens or triggering factors like dust, fog, pollens etc. can cause the precipitation of these symptoms. These symptoms are exaggerated esp. in winter or cold environment.
There is particular neuronal mechanism exists. When ever you are exposed to allergen there will be release of histamine, this is responsible for raised lesions on skin leading to itching. The order may differ from individuals to individuals.
You need to identify such allergen and prevent further exposure. Oral anti histamines and low potency corticosteroids will help to reduce the symptoms. I suggest you to consult allergy specialist. Take care and regards.
Also flea bites blister if have a mark like a mosquito bite with a small blister in the center it’s a flea bite.
So it could be is bed bugs but they would bite the entire family or it could be is a heat rash they blister as well or it could be hives or a heat rash. Only your Dr. can tell you for sure.