Melasma and freckle can be distinguished from each other in terms of causes, symptoms and treatment. 1. Different causes: the cause of chloasma is not yet clear, which may be related to factors such as genetic susceptibility, prolonged exposure to sunlight and change of sex hormone level. On the other hand, most of the causes of freckles are due to autosomal dominant inheritance and prolonged exposure to ultraviolet rays. 2. Different symptoms: Melasma is mainly characterized by yellow-brown pigmentation spots on the face, usually symmetrically distributed and aggravated and persistent under sunshine. Freckles are mainly found on the nose, cheeks and other exposed parts of the face, with individual differences in color, size and quantity and corresponding changes with seasonal changes. 3. Different treatments: For chloasma and freckle, besides laser treatment, chloasma patients also need to cooperate with doctors to give medication to relieve the symptoms. It is suggested that patients who are willing to be treated should go to regular hospitals for diagnosis and treatment by professional doctors.