Can I use this lotion (prescribed for Acanthosis Nigricans) on my face pigmentation? : r IndianSkincareAddicts Glutathione 500 mg Plus 21st Century Vitamins 21st Century Vitamins Glutathione 500 mg Plus 21st Century Vitamins 21st Century Vitamins Acanthosis nigricans, also known as Dark neck black neck, is a skin condition that causes darker, thicker skin and that may feel velvety. It usually appears on the neck, folds of the