Melasma is the gray-brown hyperpigmentation of the skin. It is also known as the pregnancy mask. Skin diseases are observed equally frequently in women who are pregnant and not pregnant. While 90% of melasma cases are women, 50% to 70% of this rate is pregnant women. For this reason, it is the most common cosmetic problem related to pregnancy. Its etiology is still unknown. There are studies that include the main factors causing its occurrence; exposure to UV radiation, pregnancy, genetic factors, hormonal therapies and cosmetic product use. The most effective way to be protected from melasma is to avoid excessive exposure to the sun in order to prevent its formation during pregnancy.