COSRX AC Collection Ultimate Spot Cream in Beauty: NA. Formulated with proprietary COSRX Centella AC-Rx Complex, the AC Collection Ultimate Spot Cream not only treats acne, but also helps the skin recover without any irritation. The calming formula includes three legendary healing ingredients: Madecassic acid to calm and protect, Asiaticoside to keep skin clear, and Asiatic acid to strengthen the skin barrier and maintain a balanced complexion.. Aloe Barbadensis Leaf Water protects skin from irritation. Zinc Oxide provides antimicrobial, anti-inflammatory, and wound-healing properties. Calamine soothes inflammation and irritation. 1.05 oz. Apply an appropriate amount to the affected area after cleansing. For optimal results, apply a thick layer on the affected area before going to sleep. CORX-WU48. COS257. COSRX - pronounced kos-are-ex - is committed to making ingredient-oriented, high-performance skincare. Using a minimal number of highly effective natural extracts in concentrated doses, COSRX products deliver visible results by treating skin with only the essentials it needs and nothing it doesn’t.