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(Leaving the peel on the apple is optional.) Next, mix it in and be sure to bind all three ingredients together. Using the back, curved part of a spoon is the easiest way.
Puree the apple in a food processor, blender, or any other appliance used to puree food. Add the warm milk, and mix until blended. Add the egg yolk and break it a bit. If you see that your mixture is a bit too runny, add a bit of oatmeal to make it more spreadable. Spread the mixture on your face. Leave on for 10-15 minutes, and wash/rinse it off with warm water. Pat dry with a towel.