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What is lanugo and what causes this hair to grow?

What is lanugo and what causes this hair to grow?

Lanugo is a type of fine hair that grows on the bodies of human fetuses while they are developing in the womb. These hairs disappear either by birth or shortly after when vellus hairs replace them. Vellus hairs are also naturally fine and transparent, but thicker than lanugo hairs. Vellus hairs are the hairs typically […]