The difference between photorejuvenation and ultra picosecond includes different wavelengths and different indications. 1. Different wavelengths: photorejuvenation mainly includes 515nm, 560nm, 590nm and other wavelengths of continuous light; ultra-picosecond laser mainly includes 532nm and 1064nm two wavelengths. 2. Different indications: photorejuvenation has more indications, which can be mainly used to eliminate and lighten various superficial pigment spots, improve capillary dilation, increase skin elasticity, eliminate fine lines, reduce pores, improve oily skin, etc. Ultra picoseconds are used for the treatment of epidermal spots such as freckles, aging, coffee spots, etc., as well as deeper spots, such as nevus of Ota, etc. It is recommended that patients should go to a regular clinic for the treatment of their condition. It is recommended that patients go to regular medical institutions according to their own conditions and choose the appropriate treatment under the guidance of professional physicians.