1.Treatment often takes several times, which is related to the type and degree of lesions and individual differences. Most children with increasing treatment times, the lesions gradually reduce and subside, but individual children may not be obvious treatment effect. 2.After laser treatment, local redness, blistering and crusting may occur, which should be left to fall off naturally to avoid scarring. 3.After the treatment, topical ointment should be applied to prevent infection and promote skin repair. 4.The treatment area should not be exposed to water, avoid sunlight, do not participate in strenuous activities, and do not eat spicy and stimulating food to avoid infection. 5, according to the needs of the disease, may need to combine with injections, oral and other treatments. 6.A few children may have hyperpigmentation or hypopigmentation, generally recovering in 3-6 months, and very few children need about a year. 7.The efficacy of the treatment will be different due to different parts, different degrees of lesions, different growth periods and different sensitivity to laser.