Acids gently exfoliate to smooth texture and keep pores clear. Start with PHA or low strength BHA two nights a week and use sunscreen every morning. Browse Anua Heartleaf 77 PHA Clear Pad, Abib Green LHA Pore Pad, CeraVe Skin Renewing Nightly Exfoliating Treatment and The Ordinary Azelaic Acid Suspension 10%.