The most common reason for darker upper lip hair is a change in your hormone levels, specifically an increase in androgens.
Here's a more detailed explanation:
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Hormonal Changes: The primary driver behind darker upper lip hair is an increase in androgens, which are often referred to as "male hormones," even though they're present in both men and women. Higher levels of androgens can stimulate the growth of thicker, darker hair in areas where fine, light hair (vellus hair) already exists, such as the upper lip.
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Menopause: For postmenopausal women, hormonal shifts are common. The decrease in estrogen levels can lead to a relative increase in androgens, triggering the development of facial hair.
Therefore, in summary, changes in hormone levels, especially an increase in androgens, are a very common reason why upper lip hair might become darker.
