Laser hair removal can last for several years related to the number of times of hair removal, generally need about 3-5 times, can destroy all the hair follicles, to play a permanent hair removal effect. Laser hair removal is the use of laser technology, through selective photothermal action, so that the hair follicles are instantly destroyed, in order to achieve permanent hair removal or delay hair regeneration time, mainly for dark or light colored hair, the effect is not obvious for white hair. A series of skin reactions may occur after laser hair removal, such as pain, erythema, edema around the hair follicle, and in serious cases, blistering, pigmentation and hypopigmentation, etc., which can generally subside on their own within a few hours without special treatment or local ice to relieve them, and in serious cases, timely medical consultation with dermatology is required. After laser hair removal, pay attention to protect the skin of the hair removal area, keep the local cleanliness and hygiene, pay attention to sun protection, avoid sun exposure as much as possible, etc.