Personally, I use zinc oxide based ointments such as Burts Bees Baby and Metanium, found them perfect. On the rare occasions where I've had a rash (or even an irritation, don't wait until it becomes a rash), usually after wearing a plastic backed item, I use Daktarin / Daktacort or any other strong athlete's foot treatment cream, which have anti–fungal properties and are effective against ringworm and sweat rash. Also, if you can, have a dry day or two, to allow itchy skin to recover. Hope this helps.