Brown spots on the skin may often be perceived as a sign of aging, like fine lines and wrinkles. Freckles may have been cute when you were a kid, but now these melanin deposits are looking more like the aging remains from too many days lounging in the sun. Freckles, sun spots, liver spots – whatever you call them, they’re technically known as “pigmented lesions” and they form when melanin concentrates in one area of the skin, usually as a result of over exposure to the sun’s UV rays.