My three year old kid developed a rash with modest blisters. Any suggestions what this could be?

Rash on lupus rash: query pink'n'fluffy : My 3 year old kid created a rash with little blisters. Any tips what this could be? The rash covering most of his body, and in some places have tiny white bubbles. The rest of his rash is red, dry and rather bumpy. He thinks it is a little itchy, and it also has a sore throat, which may very well or might not be connected. I spoke to NHS direct, but they have been not quite useful Preferred answer :. response by Tricia you tried adding a glass at

Itching Urticarial Rash