The first step is to apply a cold compress to cool down the skin for an hour. The laser has an exfoliating and cavitating effect, and the treatment will result in local crusting, so you can apply clean, restorative, gentle and non-irritating products. 4. Strict sun protection, especially within 3 months after treatment to avoid exposure to the sun, you can apply sunscreen after the crust falls off, and prohibit the use of sunscreen before the crust falls off. Through this series of treatment later let the skin slowly repair, usually will not leave pigmentation spots.