What is Salicylic acid?

Amanda Hercules Updated by Amanda Hercules

A well-known beta hydroxy acid (BHA), salicylic acid helps shrink and soothe deeper spots by dissolving dead skin cells and unclogging pores. 

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When should I use Hydro-Star + Salicylic Acid over classic Hydro-Stars?

How many times a week can I use the Hydro-Star + Salicylic?