could you please tell me what this may be??
The first suggestion I have is for you to see a doctor as this description could be anything. There are many things which can cause a blistery rash such as: Poison Ivy, Poison Oak, or Poison Sumac. Here are some images to look at of the rashes caused by these poisonous plants.
Impetigo is another possibility where blisters are involved. If it is severe it can be treated with antibiotics.
There are also other possible causes for your skin reaction so you absolutely want to be seen by a doctor.
Hope you find out what this is so that you can get treatment. Thank you for your question.