Altruist Dermatologist Cleansing Foam 2% Salicylic Acid 150ml – Cleansing Foam – Beauty & Skincare. Refresh and purify your skin with Altruist Dermatologist Cleansing Foam 2% Salicylic Acid. Expertly formulated to cleanse effectively while helping to remove excess oil and impurities, this lightweight foam leaves skin feeling clean and refreshed.