I have itchy red rash on butt and thighs, remedy?

The itching. May respond to benadryl (diphenhydramine). But, don't know what the rash is - so can't comment about how to make it go away. An evaluation by your dermatologist is your best bet.
Benadryl (diphenhydramine) is a sleepi. Benadryl (diphenhydramine) is a sleeping pill. It will only make you drowsy ; accident prone. It will not help this kind of itch except by sedation. See a dermatologist. Meanwhile try otc hydrocortisone.

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