Melasma is a skin condition which causes brown to gray-brown patches, mostly on the face. In many people it afflicts bridge of nose, forehead, cheeks, chin, and above the upper lip. Patches can also form on parts of the body that are exposed to sun like forearms and neck.
Melasma is treated using preventative measures like sun avoidance and sun protection by applying sunscreen every two hours. Women are more prone to getting melasma than men and occurrence is more common during pregnancy.