Reasons why some girls grow beards and mustaches:
There is only one reason for this excessive secretion of testosterone. Many women nowadays have high levels of testosterone. Testosterone is the male sex hormone. It is also excreted in the body of women but in minimal quantities.
The female sex hormone is estrogen. Decreased estrogen levels increase testosterone levels. As a result, male-like behavior, such as big upper lip, cheeks, hands, and feet, begins to appear thick hair. Some women’s voices also become more massive because of this.