Melasma Upper Lip

Melasma is characterized by an uneven and patchy pigmentation that arises from a variety of causes, including: Genetics Hormones Sun Exposure Chronic or active inflammation Unlike typical sun-induced suntans, hyperpigmentation from melasma is not transient. The discoloration is chronic and progressive. The pigmentation results from a genetically-determined hypersensitivity of receptors on the melanocytes on certain key areas of the face, including the jawlines, forehead, and cheeks... more

Melasma is a condition of excessive pigmentation on the face, and usually in women.  It can occur anywhere, but common areas are the forehead, cheeks, and upper lip.  You should consult a dermatologist for diagnosis and treatment options.