Hello,
Without examination, it is very difficult to pinpoint a diagnosis, but the different possibilities are an allergic reaction(like contact dermatitis,hay fever,food allergies etc),hives , scabies bites or a viral infection.
I feel that a clinical examination by a dermatologist will be the best.Till that time,pls apply some calamine lotion on the rashes and avoid scratching them.You can also take some over the counter antihistaminic like Benadryl or Claritin. They will help in controlling itching.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.