LA Roche Posay Astringent contains LipoHyrdoxy Acid which is derived from Salicyclic Acid. LHA has a tendency to exfoliate skin cell by cell gently which gives better results than any other acid. Vichy Normaderm Pore Tightening Lotion contains Glycolic Acid and Salicylic Acid along with Thermal Spring Water. Which is more effective on Acne. Read to know...