These itchy small bumps which are like blisters can be due to contact dermatitis, allergic reaction, heat rash or scabies bites. Since Benadryl and topical steroids have proven unsuccessful, hence it is better to get scabies ruled out.
You should change the bed linen, your clothes and wash them in hot water and dry them in sun. You can also use medicated soaps as well for bathing. He should be isolated so not to pass the disease to others. Personal hygiene is needed. You should see for any nearby pet infected with it too which can be the cause of transmission of disease.
Also get this possibility evaluated from a dermatologist. The usual treatment of scabies is topical permethrin. It is the most effective scabicidal medication.
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.
Rash has gone away. Stayed with me for about a week and faded away. slowly from inflamed red, then to just pin ***** size dots, now gone. just creams and benadryl. dont think either helped but thats all i used. have no clue what it was, but im thinking something in my diet. I was on a strict diet and lost alot of weight and came off it not long ago and maybe the change in my diet. never been alergic to absolutly anything my whole life. food or pollen. no allergies, so dont think it was that