Melasma is caused due to the hormonal changes that an undergoes during pregnancy which may raise melanin production in your body. Melanin is a substance that body naturally produced by the body and gives colour to hair, skin and eyes.
Sun exposure will play a major role in the production of melanin in the body. And also women with darker skin tones are most likely to have melasma than fair skin tones.
All the skin pigmentation caused by melasma will soon disappear after the delivery. but you can also do some precautions to minimize the spots during pregnancy.
To know more: https://theputchi.com/blogs/birth-of-putchi/melasma-during-pregnancy
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