Young Brunette Girl With Long Hair Outside

Human hair growth
Hair grows everywhere on the external body except for glabrous skin, such as that found on the soles of the hands, feet, and lips. It does not grow on mucus membranes either.
Hair follows a specific growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen phases. Each phase has specific characteristics that determine the length of the hair. All three phases occur simultaneously; one strand of hair may be in the anagen phase, while another is in the telogen phase.
The body has different types of hair, including vellus hair and androgenic hair, each with its own type of cellular construction. The different construction gives the hair unique characteristics, serving specific purposes, mainly warmth and protection.