The effect of freckle removal is influenced by many factors. The first is the type of spots. For example, super picosecond freckle, the general effect is good. However, if you treat chloasma, you may need to cooperate with other treatment methods to achieve good results. Because the etiology of chloasma is complex, sun exposure, basic endocrine diseases and even neuropsychiatric factors can induce the recurrence and aggravation of chloasma, so the effect of treating chloasma with picosecond laser alone is not easy to maintain without other treatment methods. Secondly, in order to achieve good results, the operator's experience and the choice of treatment parameters are also very important. If the laser parameters are not properly selected and the energy is too high, it will also cause post-inflammatory pigmentation and even skin damage after treatment.