Photon hair removal is the use of selective photothermolysis principle of strong pulse light source, using the absorption of melanin cells in the hair follicle to the specific wavelength of light, so that the hair follicle produces heat, thus selectively destroy the hair follicle, while avoiding damage to the surrounding tissue to achieve the effect of removing hair. And the use of improper may cause harm, as follows: 1, due to the different personal physique, the parts of the home photon hair removal instrument after treatment may appear slightly red or local edema, because in the process of hair removal photon hair removal instrument will produce 20-30 joules per square centimeter of light intensity, this time heat is the inevitable result. But this situation will generally disappear after a few hours, before and after the treatment to reduce sun exposure can avoid this side effect; 2, photon hair removal is suitable for patients with hirsutism and people with light skin tone, etc.. If the skin color is darker, the light source produced by the photo hair removal instrument will destroy the skin pigment together causing white or dark spots, which will take several months to recover. People with darker skin tones should choose photorelief treatment with caution.