A soothing and anti-inflammatory preparation should be applied. Any itching sensation needs to be quickly relieved to prevent scratching and further skin damage.
If a rash is caused by a substance, avoid using the substance as well as any products containing known irritants such as soap and lanolin. This is particularly important immediately after healing when the skin may still be sensitive.
Emollient creams will help keep the skin in good condition and can help to prevent recurrence.