A Change of Wardrobe
If you develop a heat rash, the first thing to do is cool down and put on loose-fitting clothing, which will help prevent the rash from becoming worse. Don't wear anything that prevents your body from sweating.
With intertrigo, a heat-related rash caused by skin friction, keep the area clean and dry. This will prevent a bacterial or fungal invader from infecting the already cracked or damaged skin, which can make a painful condition much worse [source: Mayo Clinic].