Are the blisters fluid filled? It could be chicken pox if you did not have that earlier in life. There can be other reasons for these blisters as well. Its best to get examined by a physician or skin specialist to correctly diagnose the condition. Its very difficult to give diagnosis on the basis of provided information alone.
Next Steps
for the time being, you can apply lacto calamine lotion for symptomatic relief. But be advised best diagnosis can be through physical examination by a trained eye.