Hairs are classified as long, short and fine hairs. The growth cycle of hair can be divided into anagen, regression and resting phases. General hypertrichosis is an increase in body surface hair and most have a family history of hypertrichosis without masculine manifestations. Traditional treatments for excessive hair include chemical hair removal, waxing, shaving, plucking, and electrolysis. Available optical instrument treatments include laser hair removal and photon hair removal. The lasers used for hair removal are ruby laser, semiconductor laser, emerald laser, Nd:YAG laser and the target of treatment is the melanin in the hair follicle area. Photon hair removal is the same as laser hair removal and also targets the melanin in the follicle area, but is slightly more comfortable and less painful. When the hair is in the anagen stage, the hair follicle contains more melanin, so laser and photon treatment is effective at this time. However, not all hairs are in the anagen stage, so hair removal needs to be done several times, and the interval time generally varies from site to site. Laser hair removal also has corresponding precautions, including: choose regular medical institutions and experienced doctors; do not use hair removal cream, hair removal cream and other cosmetics before hair removal; the best clean body and bath before hair removal; there is a certain warm feeling when the laser penetrates the skin, which is a normal phenomenon; after hair removal, you can cold compress hair removal place for 10-15 minutes, hair removal place should avoid exposure to the sun; review after 20-30 days after each hair removal to determine After 20-30 days after each hair removal, you can decide whether to carry out the next treatment or make an appointment for the next treatment.