Your Gua Sha stone can be stored in the fridge. The colder it is the more soothing and constricting it is on your face. To clean your Gua Sha stone you can use soap and warm water.
Redness may occur after treatment of your face and neck. This is normal. It is believed in Chinese medicine that redness (sha) is the healing response of your body. The Jade stone is believed to carry healing energy.