It is autosomal dominant, and its development is related to sun exposure, so the pigmentation spots are limited to exposed areas. Freckles are most common on the face (especially on the nose), shoulders and upper back. The number of freckles increases in summer, the color deepens and the damage becomes bigger, while in winter, the number decreases, the color becomes lighter and the damage shrinks. In the past, the traditional methods of spot removal were just whitening, chemical peeling and sunscreen. However, they are often ineffective and prone to recurrence. With the introduction of intense pulsed light, the treatment of freckles has undergone a revolutionary change. Most patients can say goodbye to freckles after only 1-3 treatments with an interval of 3 weeks. The treatment principle of intense pulsed light is “selective photothermolysis”. The energy of the photon is only selectively absorbed by the pigment vesicles in the freckles, which are broken up in an instant with a blasting effect. The photon energy is only selectively absorbed by the pigment microsomes in freckles, which are broken up instantly with a blasting effect. Since photons are only absorbed by pigment groups, the surrounding normal skin will not be damaged, so the effect of freckle removal is very safe. The treatment process takes only 15 minutes, and you can wash your face, put on makeup and do exercise immediately after the procedure. After 2-4 treatments, the clearance rate of skin lesions can reach over 95% in all patients.