Light salicylic acid leave on treatment with calming ingredients, bought this on rec. of influencer who shared their regime after fighting acne and gaining a "glass skin" effect. I use it 3X a week, it helps unclog pores, clear acne and reduce bumps on face and decolletage. I have sensitive skin which stays calm with this product, it does not feel "stinging" and I can use it in the morning and wear all day. Prob not good to combine with other acidic products at the same time.