The prevalence of freckles is as high as 18.7%, with a female predominance. It often starts to appear around the age of 6 years old and worsens around puberty. It often occurs on the exposed parts of the skin, especially the face, especially the nose and cheeks, and in heavy cases, it can involve the back of the hands, neck, shoulders, back and other parts. It appears as light brown or dark brown dotted pigmentation spots, round, oval or irregular in shape, with clear borders, generally about 2mm in diameter, smooth surface, isolated but not fused, with uneven distribution and without any conscious symptoms. The number, size and color of pigment spots depend on the amount of sunlight absorbed and the sensitivity of individuals to sunlight. In the past, the application of carbon dioxide laser, freezing and other methods to treat freckles, the effect is not complete, and will leave unacceptable scar. Q-switched Nd:YAG laser has become the most commonly used laser to treat freckles, which can emit two wavelengths of 532 and 1064nm. Q-switched technology can produce very high energy (10-100MW) in a very short time (1-50ns) to destroy pigment particles in the lesion. 532nm is the most commonly used wavelength to treat freckles, which has a very certain efficacy on freckles. It can completely remove the lesions in almost one treatment without leaving scars, and the skin can fully recover its normal color and texture. Photorejuvenation can lighten or remove freckles, and the epidermis is intact and undamaged after treatment, without the scabbing and healing time caused by laser treatment, and can improve other skin problems at the same time without affecting normal work and life. It is suitable for patients with busy working life, other skin blemishes, unclear boundary of pigmentation or those who have received Q-switched laser treatment before; laser treatment for freckles is more thorough and can be done almost once, but local scabbing will take 5-7 days to heal and fall off after treatment, avoiding water for 3 days after treatment, which will have some influence on normal work and life. It is suitable for patients who have sufficient time to recover, no other skin blemishes and clear boundary of discoloration. Patients can choose the method suitable for them according to their situation. After any treatment, you should try to avoid sun exposure and apply sunscreen. Some patients can have recurrence after treatment, and those with recurrence can be treated again and still achieve good results. Strict sun protection can reduce, mitigate and slow down the recurrence of freckles.