At present, there are more kinds of laser treatment instruments, the side effects of different treatment instruments are different, the common side effects after laser treatment include skin pigmentation, local scarring, skin burns and so on. 1. Skin pigmentation: different symptoms of laser treatment with different treatment energy, if the treatment operation is not standardized, set the energy value is not correct, may produce skin stimulation and cause skin pigmentation. If the operation is not standardized and the energy value is not set correctly, it may stimulate the skin and cause skin pigmentation. If you do not pay attention to the protection after laser surgery, you may also cause postoperative pigmentation. 2. Localized scarring: when keloid patients undergo laser treatment, it may lead to localized scarring due to non-standardized treatment operation, too much energy, too deep and other reasons. 3. Skin burns: each person’s tolerance and sensory threshold are different, according to the specific feeling of the individual should always adjust the treatment energy of the laser therapy instrument, if the treatment energy is too high, the treatment time is too long, it will produce burns on the local skin, resulting in redness, swelling and blisters of the local tissues and other conditions. Therefore, laser treatment should go to the regular medical institutions, under the guidance of doctors to choose the appropriate treatment program based on their own situation.