AHA! If this term is more than a eureka moment expression to you, we know you’re obsessed with skincare and the word ‘acid’ doesn’t conjure up images of bubbling purple liquids in a lab. Instead, you picture a tiny bottle with a dropper. From salicylic acid to glycolic acid, this easy guide from celebrity dermatologist Dr Jaishree Sharad helps you make the most of these superheroes in your routine.