Hair is a common appendage of the skin and its main function is to protect the skin as well as to keep it warm. Most women in daily life will choose hair removal cream for hair removal, the main component is mercaptoacetic acid, but this kind of hair removal is not permanent hair removal. To achieve the purpose of permanent hair removal, the clinical choice of intense pulse light or pulse laser is mainly through the local high heat to destroy the base of the hair and the structure of the hair follicle, after the destruction of the base of the hair and the structure of the hair follicle, it will not be able to provide and deliver nutrients to the exposed hair. The local high energy also destroys the structure of the hair and causes the hair to dissolve and shrink, thus achieving the purpose of hair loss. However, since the hair growth cycle is divided into anagen, regression, and resting phases, multiple treatments are usually required to achieve eradication. Before intense pulsed light or laser hair removal, patients are advised to shave off the exposed hairs a week in advance to achieve the best treatment effect.