Calm itchy, inflamed skin using this breakfast food. Oatmeal soothes rashes because it’s packed with phytochemicals that have anti-inflammatory properties. Create a soothing bath by grinding 1/3 cup of plain oatmeal (no flavors!) into a fine powder using your blender; pour the powder into lukewarm water and stir in evenly with your hands until the water is a milky color, suggests Kavita Mariwalla, MD, a New York City-based dermatologist. Another option: use 1/4 cup of oatmeal and enough water to make a paste that you can apply directly to the skin for 10 minutes, she says.