Not to be argumentative, but how do you know that you have heatrash and not... so that they can eyeball it and give you the proper diagnosis. In the meantime, I'd avoid applying anything on the rash...
Move the patch around, with every change. The itchiness and redness will usually get better in a day or so, if it is not go see your doctor or urgent care. While waiting for it to go away. If you can, don't put anything on it
How To Deal With A HeatRashby
We are all, I’m sure, familiar with that common hot weather complaint, the heatrash... for them.
However, it is not just the heat that can cause this so-called rash - just wearing tight or synthetic clothes...
Home Remedy: Acne Prevention and Treatmentby
effect on acne.
6 – Avoid foods that increase heat in the body, spicy foods, chocolate and coffee.
7...- Enough sleep is a killer treatment for ache.
9 – Lemon juice wash. Apply cotton ball to face soaked in lemon...