Oatmeal baths are popular recommendations for skin afflictions, as it is a naturally anti-inflammatory experience that can eliminate redness and irritation. If you are suffering from a body rash, it may be caused by anything from poor hygiene to a food allergen, but it should be treated just like any other skin infection. A single cup of oatmeal mixed in your bathwater can flood your skin with nutrients and anti-inflammatory compounds, thus relieving the pain and itchiness of a rash. This can be done once daily until the rash disappears.