Pigmentary disorders are a main cause of concern while trying to achieve a smooth, flawless skin. Skin coloring diseases can be of two types- melasma or vitiligo. Learning about both the symptoms of both these diseases may help in choosing the right skin treatment for it. Melasma or hyperpigmentary refers to the darkening of the skin color. This may happen due to unusual exposure to sun or certain hormonal changes. This skin disease usually occurs in pregnant women and sometimes it gets cured on its own after some time of the childbirth. Vitiligo or hypopigmentary refers to the lightening of the skin. This is a more complex problem and may occur anytime after childhood to the adult age. Her the complete skin or some patches may become lighter than the others and give an uneven tone.