Skin discoloration refers to any change in your natural skin tone. Common causes include birthmarks, infection, and skin pigmentation disorders. Some birthmarks, such as dermal melanocytosis ...

These patches are typically flat and appear darker than an individual’s skin tone. They may be brown or gray in color. The melasma may develop in one specific place with defined edges ...

"Melanin is what makes skin appear to be a particular color, whether white, tan, brown, or dark brown to black. Almost everyone has melanin," says Christine Ko, MD, dermatologist at Yale Medicine ...