Rash in scabies is usually found in the folds of
skin and they are red blister like
rashes. it can be due to allergic reaction, hives or insect bites. Take some antihistaminic like Benadryl or Claritin and apply some calamine lotion on the rash. If the symptoms persist then please get it examined from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided.