PHAs are a much bigger size compared to AHAs and BHAs. This allows them to only exfoliate the skin's outer layers. "BHAs really dive deeper into the skin, dissolving sebum and dead skin cells down in the pores, so they are often more suitable for oily skin and keeping acne at bay," Ava Shamban, MD, a Beverly Hills dermatologist told a news portal. PHAs work best if your skin is in need of hydration or to tackle signs of ageing. "These acids are humectant, so they have the ability to support moisture retention in the extracellular matrix, giving a firmer, plumper appearance to the skin," Shamban explained.
by Darielle Britto