When the natural lip color is discolored or darkened, the lips are said to be pigmented. It is ordinarily caused by an unhealthy lifestyle or poor grooming habits. Pigmented lips can also be caused by genetics and medical conditions.
Pigmentation refers to a lightening or darkening of the skin. It is also referred to as melasma or chloasma. It is a common skin condition and involves the development of a brown or gray coloration, mainly on the face. The lips are particularly susceptible to this discoloration. It is most common in women with darker skin tones who live in warm climates.