Dark spots on legs are mainly due to pigmentation, which can be treated by physical therapy, medication and surgery. 1. Physical treatment: such as carbon dioxide fractional laser, picosecond, etc., can lighten the dark spots on legs through the thermal damage of laser to peel off the epidermis, selective photothermal effect to break down the pigment particles and so on. 2. Topical medication: such as topical hydroquinone cream, azelaic acid repair cream, which can promote the absorption of local pigment and then lighten the dark spots on legs. 3. Surgical treatment: If it is a large area of pigmentation, skin abrasion can be carried out with topical growth factors and other drugs to promote the healing of wounds, in order to remove the dark spots. If you have black spots on your legs, you need to go to regular hospitals as soon as possible to have individualized diagnosis and treatment plan according to your specific condition, so as not to delay your condition.