An oatmeal bath can be made by grinding oatmeal or buying the colloidal oatmeal from the market. Irrespective of how it is made, do remember to make the mixture in lukewarm water to get the best results. Oatmeal is best known to treat itching caused by poison ivy, bug bites, chickenpox, and eczema. According to a popular belief, ancient Egyptians, Arabians, Romans, and Greek used oatmeal in 2000 BC to cure skin problems and for beautification too. No wonder, the wonders of the world came from there!