Hello,
Is the rash bright red?
It could be what we call atopic dermatits. He would need strong steroid cream or even oral. This is by prescription.
Keep it very moisturized with lotion. 3 Minute rule - when out of shower dry off and apply lotion within 3 minutes.
You did not mention Benedryl but you may have already tried it.
I would say it is time to see your provider.
Nurse Practiti&oner
I am a board certified Nurse Practitioner and have practiced for 13 years.