Lemon Folk Remedy: It seems as though what you are describing is post-inflammatory hyperpigmentation, or the dark areas of skin after a pimple or skin injury has healed. Lemon juice may take a few weeks, but it can be irritating to the skin. It is acidic, has vitamin c, and some antibiotic properties. Azelaic acid is used to treat acne. Many products out there: http://www.mdpi.com/1422-0067/10/12/5326/htm
Answered 11/28/2017
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