Answer :
Final answer:
Chloasma, also known as the "mask of pregnancy", is the skin condition that causes darkening of the skin around the upper lip due to hormone fluctuations. It involves an increase in melanocyte-stimulating hormone (MSH) during pregnancy, which stimulates melanin production in the skin.
Explanation:
The skin condition that causes darkening of the skin around the upper lip and is triggered by hormone fluctuations is called chloasma or the "mask of pregnancy".
This darkening of the skin occurs due to an increase in melanocyte-stimulating hormone (MSH) during pregnancy, which leads to increased melanin production in the skin. The darkening of the upper lip is a common symptom of chloasma.
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