[Social Habits] Almost every patient and family member will ask a question when their doctor suggests they undergo laser treatment: will it leave scars? Many people say that removing birthmarks can leave scars, is that true? Before laser was used in dermatology, many diseases were helpless to dermatologists, such as the treatment of nevus of Ota. Traditional treatment methods such as skin grinding or skin peeling have a high chance of pigmentation (darkening), pigment loss (whitening), scarring and other after-effects after treatment. The emergence of the laser is an epoch-making invention in the field of cosmetology and has become a “sword” in the field of medical cosmetology, making it possible to treat many disfiguring diseases with fast, effective and short recovery periods. Does the laser treatment leave scars or not? Most of the laser cosmetic treatments will not leave scars: treatment of various pigmented spots (nevus of Ota, Mongolian spots, coffee spots, brownish nevus of cheek, freckles, seborrheic keratosis commonly known as age spots), post-inflammatory pigmentation spots, chloasma, sun spots, etc.), treatment of various vascular diseases (bright red nevus, hemangioma, capillary dilation, etc.), vitiligo, superficial pigmented nevus, facial viral warts, skin rejuvenation, hair removal, etc. Hair removal and other treatments. These treatments are almost non-invasive and will not leave scars after surgery. 2. Treatments that may leave scars: spider nevus, pigmented nevus, some hemangiomas, etc. Spider nevus: as the name suggests, it is named because the disease itself resembles a spider and consists of a spider body and a spider foot. The spider body is a red papule in the center of the lesion, while the spider foot is the surrounding radially dilated capillaries. If the central part is pressed with the tip of a pencil, the spider nevus will disappear because the blood flow direction of spider nevus is from the central point to the surrounding capillary branches, if the central part is pressed, the blood flow will be blocked and the spider nevus will disappear due to lack of blood. Laser treatment of spider nevus can often achieve good results in 1-2 times, but since the central “mole body” is the source and is often deeper, it is possible that the middle point will leave a small pit, and the surrounding radial vasodilation usually does not leave a scar. Laser grinding: Treatment of some diseases, such as pigmented nevi and thicker seborrheic keratoses, requires the use of the grinding action of a laser. Whether this treatment leaves a scar or not depends mainly on the depth of the lesion. Here are two examples: the treatment of tattoos and pigmented nevi! Tattoo, is an art, but not you want to say bye-bye! Tattoos as a trendy culture, sought after by many young people, but when they go back to face their parents, most parents will “at all costs” to let them “wash off” the tattoo, especially in the face of the military, work physical examination. That tattoo in fact can not “wash off” it? 1, I want to wash off the tattoo should not go to my tattoo place? When you ask the tattoo artist, you do not like this done can not be washed off? Some tattoo artists in order to facilitate business, often tell you that if you do not like it after you can wash off. Many places to do tattoos and even play the “tattoo, wash tattoo” sign. In fact, he simply can not help you wash off the tattoo. First of all: some tattoo institutions use their “unique” potion to wash tattoos, in fact, is the use of chemical corrosion methods, this method is often a greater local damage, easy to form scarring, pigmentation abnormalities and other more serious side effects. Second, laser treatment is undoubtedly the best modern science to remove tattoos, but the need for specialized laser cosmetic physician operation, the tattoo artist is not qualified to operate, and good beauty laser machines are often very expensive, up to millions, the general small tattoo studio will not have such an expensive machine. So before the tattoo do not believe that tattoos do not like to completely get rid of the statement. 2, laser removal of tattoos will leave scars? Laser removal of tattoos can selectively act on the tattoo dye, so that it blasts, blasting small particles gradually absorbed by the body excreted, do not harm normal tissue, so it will not leave a scar. But now there are some 3D tattoos are very beautiful, looks very three-dimensional, in fact, we can imagine, you can also touch found, these will be slightly raised than normal skin, these tattoos are often in the tattoo that formed a scar, laser removal of pigment may leave a raised mark.