You can apply some calamine lotion at the rash as it will help in soothing the
skin. You can take some OTC oral
antihistamine medications like Benadryl or Claritin and see if it helps.
For mild-moderate symptoms a weak steroid may be used (e.g. hydrocortisone as dermacort), whilst more severe cases require a higher-potency steroid (e.g. clobetasol propionate, fluocinonide).Also use good quality moisturizers to prevent moisture loss from the skin.