Melasma on the lower legs can be treated by giving topical decolorizers and helped by physical therapy if necessary. 1. Topical decolorizers: frequent exposure to ultraviolet rays leads to chloasma on the lower legs. It is recommended to pay strict attention to sun protection and give topical decolorizers, such as hydroquinone cream, if necessary, which can produce reversible skin discoloration by inhibiting the oxidation of the corresponding enzymes. 2. Physical therapy: Physical therapy, such as intense pulsed light, picosecond, etc., can be given as prescribed by doctor when necessary. Strict attention should be paid to sun protection after treatment. If you have chloasma on the lower legs, it is recommended to go to the hospital to understand the causes of localized chloasma and standardize the treatment according to the doctor’s advice, and do not use medication on your own.