How many of these bumps appear at a time? How many are present now? It sounds that there may be a few possible explanations ...
If you may be able to post a picture of one or more of these bumps that may be helpful ...
It may be some type of bite such as a mosquito bite --- Do these episodes happen more when you are in warmer months? Time spend outside ? These if true may fit with mosquito or other type bites as one possibility
Do blisters more occur in small groups ? Limited to the hands? More in between fingers ?? If this is the case then you may have a condition of dishydrotic eczema >>> this may improve with a moderate or high potency steroid cream for a week or so ( stroger steroid topical creams would be by prescription )
The itching would be helped in either case by taking an antihistamine and these are over the counter --- Zyrtec or Benadryl or Alleges should be helpful
I hope that this information is helpful for you
Let me know if you have further details/ pics/ question/ concerns / discussion.
I will be happy to get back with you
If my answer has been helpful and to your satisfaction then please remember to leave positive feedback
Thank you and Best Regards,
Anthony Bray MD