A: We suggest Hello Kitty Sheet Mask can be used chilled to cool skin. We also inform that all Pixi products are developed with skin-loving botanical ingredients chosen for their effectiveness and safety. All our products are safe to use as directed and follow the required cosmetic safety guidelines provided by the FDA and other local authorities. If you are new to using _GLYCOLIC ACID/LACTIC ACID/SALICYLIC ACID/RETINOL/ACTIVE INGREDIENT_, we recommend doing a patch test for sensitivity on your inner elbow prior to using a product. If you need further advice on a specific ingredient to target your skin concerns, we recommend consulting your physician or dermatologist. For real-time answers to all your beauty questions, use the “Chat with a Virtual Beauty Consultant” button on any beauty product page.