Myth #1: A bottle of sunscreen to go around the world Correct: The selection of sunscreen should be in accordance with different occasions, different environments, different seasons to choose different sunscreen. Sweating or swimming to choose the waterproof type, the skin greasy can choose the spray type. The higher the SPF value, the better the sunscreen effect The correct solution: SPF value, which is to prevent medium-wave ultraviolet rays. SPF value is not the higher the better, only represents the length of sun protection time, then the use of SPF30 UV light products, there will be about 300 minutes (10 minutes × SPF30) of sun protection time. When you go out, if you choose SPF30 sunscreen, so you should replenish the sunscreen after 5 hours. After laser surgery, it is recommended to choose 15~30 can be used (SPF greater than 30 is actually not suitable for Asian people to use). Misconception 3: Only the choice of SPF value and ignore the choice of PA value Correct: When choosing sunscreens also pay attention to the prevention of long-wave ultraviolet rays, long-wave ultraviolet rays can reach deep into the dermis, causing eosinophilic degeneration of collagen fibers, resulting in photoaging. Anti this kind of ray indicator is expressed by PA, the more plus sign the better the sunscreen effect. It is generally recommended to choose products with PA value ++++ after laser surgery. Myth 4: Indoor, cloudy days do not need to use sunscreen Correct: Even indoors, in the shade, ultraviolet light can still be refracted from surrounding objects and ground reflection. Even on cloudy days, UV light can still attack the skin. Myth #5: Apply sunscreen only when you’re about to leave the house Correct: Sunscreen, like general skin care products, takes a certain amount of time to be absorbed by the skin. So you should apply it 20 minutes before you go out. Here is a reminder: sunscreen should be lightly patted to use, do not rub hard. The first thing you need to do is to get a good idea of what you are getting into. In addition to the sunscreen function, isolation cream may add antioxidant ingredients, whitening ingredients, adjusting the skin tone, but do not sleep as a maintenance product night smear. Isolation cream must be removed if the makeup removal is not complete, isolation cream residue face, will block the pores, the consequences of the serious can be imagined. So sunscreen is more refreshing and more suitable for post-laser use than isolation cream.