Chloasma or Melasma, also known as butterfly, hormonal or black spot, is light brown, grayish black or brownish black. Its borders are unclear, symmetrical and the location is mostly above the humerus. However, it may also be located at the forehead, eyebrow and upper lip. Among Asian people, such spots are very common, and their patients are mostly women.

Chloasma can be divided into three categories: Epidermal Melasma, Dermal Melasma, and Mixed Melasma, whose classification clearly shows the location of melanocyte lesions. . Usually doctors use ultraviolet light (Wood’s Lamp) to distinguish the type of chloasma.  There are many reasons for inducing chloasma, including but not limited to the following categories: 1) UV damage  2) Imbalance of hormone secretion, such as pregnancy, long-term use of contraceptive pills, hormone drugs, injection of injectables, before and after menopause, and thyroid problems 3) Genetics 4) Oral drugs: antiepileptic drugs, Hydantoin, etc. 5) External heat, such as exposure, sauna, etc.