Face acids have been gaining popularity in different phases over the past few years. Also known as "chemical exfoliants", they offer a range of benefits from making your skin even to fighting ageing. It is pertinent to note that face acids are classified into two types: alpha hydroxy acids (AHAs) and beta hydroxy acids (BHAs). AHAs work on the skin's surface and are water-soluble, whereas BHAs are oil-soluble and penetrate deeper into the pores.Types Of Face Acids For Good SkinSalicylic AcidSalicylic acid, a BHA, is renowned for its ability to exfoliate the skin and keep pores clear, making it an excellent choice for managing acne. It penetrates deep into pores to remove dead skin cells and reduce inflammation. Commonly found in concentrations between 0.5% and 2%, it's present in products like Stridex Maximum Strength Pads ($6.55) and Neutrogena Oil-Free Acne Wash ($6.30). For higher concentrations, dermatologists use it in peels to treat acne scars, melasma, and sun damage.Glycolic AcidGlycolic acid, the smallest AHA, excels in anti-aging due to its deep skin penetration. Derived from sugar cane, it's effective at exfoliating, reducing fine lines, and improving skin texture. Glycolic acid is beneficial for evening out skin tone and fading dark spots. However, it increases sun sensitivity, so pairing it with sunscreen is essential.Mandelic AcidMandelic acid, sourced from bitter almonds, is another AHA that gently exfoliates. Its larger molecular size means it's less irritating than glycolic acid, making it suitable for sensitive or ethnic skin prone to pigmentation issues. it is excellent for treating sun damage and uneven skin tone.Azelaic AcidAzelaic acid is celebrated for its dual action in treating acne and lightening post-acne marks. Found in concentrations of 15-20% in products such as The Ordinary Azelaic Acid Suspension 10%, it keeps pores clear, reduces inflammation, and can fade hyperpigmentation. It's often used as a milder alternative to hydroquinone.Kojic AcidKojic acid, a byproduct of sake fermentation, is used primarily for its brightening effects. It is effective in reducing hyperpigmentation and evening out skin tone, though it can be irritating.