How to Make Easy Homemade Oatmeal Soap. Oatmeal soap can benefit any skin type, although it's especially helpful for chapped, dry and irritated skin. It soothes the skin as it gently exfoliates and replenishes lost moisture. You can make your own oatmeal soap at home.
Put about 5 tbsp. of old fashioned oatmeal in a blender or food processor, and grind it just until it's coarse, but not a powder.
Grate 1 large bar of castile soap, or other natural, mild soap, into a large microwaveable mixing bowl.
Add 1 tbsp. water and microwave the soap and water on high for 2 to 3 minutes, or until the mixture is warm and the soap dissolves. Don't let the mixture bubble over the edges of the mixing bowl. Stop the microwave once or twice to stir the mix and check its progress.
Stir the oatmeal gradually into the soap with a wooden spoon until the mixture reaches the consistency you want.
Pour the oatmeal soap into 2 soap molds and allow it to cool and set up.