Detailed answer

While melasma commonly appears as symmetrical patches on the face, that is not always the case. Melasma can present itself in various patterns, including asymmetrical distributions. It is characterized by brown or gray-brown patches, which can occur on the forehead, cheeks, nose, chin, and upper lip. Some people may have melasma only on one side of the face, while others may have patches in different shapes and sizes on both sides. Factors such as hormonal changes, sun exposure, and genetic predisposition contribute to the development of melasma. A proper diagnosis by a dermatologist is necessary for accurate identification and treatment of melasma.