Final answer:
Melasma, also known as chloasma, is a condition characterized by blotchy brown patches of skin on the face of pregnant patients. It typically occurs in the second and third trimesters and resolves after delivery.
Step-by-step explanation:
Melasma, formerly known as chloasma, is a condition characterized by the emergence of blotchy brown patches of skin on the face of pregnant patients. These patches are caused by an increase in melanocyte-stimulating hormone and estrogen during pregnancy.
Melasma typically occurs during the second and third trimesters of pregnancy and can persist throughout the entire pregnancy. However, it commonly resolves on its own after delivery.
Therefore, the correct answer is (a) Resolves after delivery.