Take oatmeal of any brand available; however, make sure that you do not use flavoured varieties. Place the oatmeal in a blender or food processor and pulse until the oatmeal grains are shredded into smaller pieces which don't have jagged edges. Cook the blended oatmeal following the instructions on the box and let it cool down for a bit in room temperature.
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Add lemon juice and water
Add few drops of freshly squeezed lemon juice to the above mixture. Now add enough water to the concoction to make it easy to apply on face, however, avoid oversaturation with water, since this will make the mask run down your face. Mix all the ingredients thoroughly.
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Apply on your face
Once all the ingredients have been mixed thoroughly, apply this mixture on your face to create a layer of oatmeal using your hands. Let this mixture sit on your face for 15-20 minutes, or until the mask has dried completely. Rinse off with warm water and wash your face using regular cleanser. Tap dry with a soft washcloth.
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