Alright, this looks like an allergic rash.
I will suggest that you try to identify what the possible trigger might have been. It is usually something that you use topically, like a lotion, perfume or a clothing item you recently bought.
You should start on an anti-allergic like Zyrtec or Benadryl twice a day.
Apply a topical steroid on the areas that itch the most, like 1 percent hydrocortisone cream twice or thrice a day.
You can also use calamine lotion twice a day on your body, neck down for relief and its anti-itching effect.
Protect yourself from the sun.
Do not use cosmetics and soap on the area.
Avoid warm water or a hot bath for now.
Keep your skin moisturized, use vaseline.
If all these measures do not calm down the rash in 48 hours, then see your physician to rule out scabies and other causes of a maculopapular rash.
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