What's wrong with a small patch of blisters on my body?

Sep 14 20214 people replied
Description Of Condition:

Since yesterday I found such a small piece of small blisters on my arm, I thought it was a mosquito bite at first, a little itchy and a little painful to scratch.Then today I found my face and behind my ears too, and I feel that it is slowly becoming more and more.I think it's the bed, because these days there are sleeping at a relative's house, their bed for a long time no one sleeps, temporary packing out for me to sleep, I am often sleeping on the right side, so the right side of the face, but not the left side of the face, I suspect that the cause of the bed, how to deal with this ah?I went to the school hospital, but the doctor did not tell me what medicine to use

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