Melasma is a common skin condition characterized by brown or gray-brown patches on sun-exposed areas of the face, such as cheeks, forehead, upper lip, and chin. These patches arise because melanocytes (the pigment-producing cells) become overactive and produce excess melanin. Melasma is a common skin condition, affecting up to 50% of pregnant women and 1.5%–33% of the general population, typically...