Hello,
It can be insect bite, hives, heat rash or an allergic reaction. If it is present on the trunk and there is significant pain then herpes zoster should be ruled out. Do not use any cosmetic products at the sites. You can apply some calamine lotion at the rash as it will help in soothing the skin and wear cotton clothes. You can take some OTC oral antihistamine medications like Benadryl or Claritin and see if it helps.
For mild-moderate symptoms a weak steroid may be used (e.g. hydrocortisone as dermacort), whilst more severe cases require a higher-potency steroid (e.g. clobetasol propionate, fluocinonide). But they are available under prescription and should be taken only after consulting a dermatologist.
I hope it helps. Take care and regards.
Hi-
Sounds like you need too go back to the doctor.
It might be an allergy type thing that is in your system?
I've had poison oak, mango-itis, latex allergy and they all manifested very much this way. I can't remember exactly but I think that I had to take anti histamines and use a steroids (when it was bed) for it to clear up. I would go back to the Doctor again. What a pain.
Horselip