Frictional melanosis is a pigmentation of the skin caused by friction or external mechanical pressure or injury. The main treatment for this disease is to reduce friction or to reduce the external forces on the skin. After reducing the causative agent, topical skin restorative agents, or color bleaching agents, such as topical mucopolysaccharide polysulfate cream, or topical hydroquinone cream for depigmentation, are needed. You can also take appropriate oral medications, such as oral Chinese medicine, such as rhubarb stinging worm pill and so on. You can also choose laser treatment, such as fractional laser, picosecond laser and so on.