Blemish Correcting Treatment Serum. Active /Primary ingredients include highly concentrated but pure 1.9% USP Salicylic, Aloe Vera and Niacimide. Shake the product will before using then apply a thin layer over any blemish spot. Apply a second layer if needed after the first layer dries. Lori's note: Extremely effective at reducing the blemish size and expediting heal time.