There are two things in my mind which can cause such blisters,one is Folliculitis
which is the inflammation of the hair roots caused by friction,bacteria or yeast.
The next one is Papular Urticaria
which is caused by an insect bite and can lead from a papular to blister form ( bullous pap.urticaria).
I would suggest to have a look on the web and see if any of the above conditions are similar to your problem? But the treatment is more or less the same.
I would advise you the following till you see your doctor,these can be obtained OTC.
ointment,apply on the affected areas in the morning and afternoon for 5-7 days.
2:1% Hydrocortisone cream
,apply it in the affected sites in the night for 5-7 days.
3- Tablet Zyrtec
10mg once a day before going to bed to relieve the itch,it's an anti allergic.
I hope the condition will settle down but if not then the only possible way is to see a doctor you can see the lesion live.
Thanks and all the best.