My son it 10 and has a rash that goes from his shoulder to the middle of his Back it is a single line of small blisters it started with a couple but continues to spread. The blister are not bright red or open and they are about the size of a pea but not that high.
Hi, Perhaps it is an insect bite hypersensitivity or a poison ivy like dermatitis. I suggest you use an OTC topical antibiotic e.g. either Newsprint ointment or Mupirocin ointment.  In addition, I suggest an oral antihistamine e.g. Cetirizine for symptomatic relief from itching.  Hope I have answered your query. Let me know if I can assist you further.