Experts also pointed out that the treatment of hirsutism by photon hair removal is completed by ruby laser hair removal machine, and hair removal is carried out through selective absorption of melanin. Because the energy of this laser is about 15-20%, and it can penetrate the dermis of the whole skin, photon hair removal selectively damages the epidermis and hair follicles with deep melanin, which makes the hair follicles degenerate and shrink, and achieves the effect of permanent hair removal. Photon hair removal also designed a contact cooling head, which can reduce the thermal damage to tissues caused by the absorption of laser energy by epidermal melanin, and photons can penetrate into the skin as much as possible to improve the therapeutic effect. Photonic hair removal can be widely used in patients with hirsutism, usually delaying hair regeneration for at least 1-3 months, and permanent hair removal after multiple treatments. Photon hair removal is to use its specificity and selectivity to treat hair follicles with appropriate wavelength of light and pulse energy and duration, which can reduce unnecessary damage to tissues around hair follicles, reduce complications and achieve good therapeutic effects.