If your skin tingles, burns, goes red or just generally feels irritated after using products with acids, then it could mean that your skin barrier function (also know as the acid mantle) isn't strong enough and using products targeted at acne such as AHA and BHA acids on your face could be making things worse. Is your acne prone skin too sensitive for acids? Our skin is generally slightly acidic with a pH of between 4.5 and 5.5. At this level, its barrier function is most effective, ...