Exfoliate the Skin
Pumice stones are created from volcanic rock formed deep beneath the Earth's surface. The stones come in many shapes and sizes and are usually abrasive on one side and smooth on the other. Pick a pumice stone that is oval in shape and fits in the palm of your hand. Wet your skin with warm water and wet the stone as well. Next apply mild soap to your face and the stone. You should only be using the smooth side for your face. The abrasive side is intended for thicker parts of the body such as your feet. Very gently go in a circular fashion around your face and neck for approximately 15 seconds. If you start to feel a burning sensation, you have applied too much pressure. You should feel only a very slight abrasive sensation. Over-use of the pumice stone on the face can cause skin damage and redness. Once you have exfoliated with the pumice stone, rinse your face with warm water followed by cold water for 15 to 20 seconds total. Use a high-grade moisturizing lotion to even out your skin and prevent any redness from occurring. The pumice stone should only be used once a week on your face. Remember to exercise extreme caution when using the pumice stone on your face and discontinue use immediately if irritation occurs.
References
Women Junction
Resources
Mineral Information Institute