Question
What are the causes of sparse facial hair in men?
Answer
Sparse facial hair in men is related to the level of androgens secreted by the testes after puberty. Androgens are important hormones that trigger the appearance of male secondary sexual characteristics, including the growth of facial hair, the protrusion of the Adam’s apple, and a deeper voice. Although the androgen levels in men are generally similar, the amount and shape of facial hair may vary due to individual differences, which are mostly normal phenomena.