Aroma aside, an onion face mask can do wonders for your skin. Its high sulfur content, antibacterial, anti-microbial and anti-inflammatory properties make it an ideal acne treatment. Try whipping up this super easy Oatmeal & Onion Puree Face Mask with just oatmeal, purified mineral water and one medium onion. You can kick it up a notch be adding an egg yolk and one tablespoon each of carrot juice and olive oil.