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WARNING!
Please, please, please, especially if you have sensitive skin, do not apply undiluted apple cider vinegar to your face. This is a sure way to end up with a chemical burn which hurts and is not pretty. Take it from someone who did it. It took at least two weeks of me applying diluted lavender oil to heal my mistake and remember to heal a burn you have to go through the scab and flaking stage. Not worth it!!!