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Melasma or Chloasma or Mask of Pregnancy is thought to occur as a result of hormonal changes in women, such as during pregnancy, taking birth control pills, HRT and exposure to the sun. Melasma commonly occurs in pregnant females, particularly of Asian and Latin origin. Individuals having darker or olive skin, (Asian, Hispanic, Middle Eastern) are more prone to having melasma. Source: epainassist.com/skin/melasma-or-chloasma-or-mask-of-pregnancy