Vellus hair

Vellus hair
Vellus hair
Comparison of the vellus hair (left) to the terminal hair (right) in humans.
Anatomical terminology [edit on Wikidata]

Vellus hair is short, thin, light-colored, and barely noticeable hair that develops on most of a human's body during childhood. Exceptions include the lips, the back of the ear, the palm of the hand, the sole of the foot, some external genital areas, the navel, and scar tissue. The density of hair – the number of hair follicles per area of skin – varies from person to person. Each strand of vellus hair is usually less than 2 mm (1/13 inch) long and the follicle is not connected to a sebaceous gland.^[1]

Vellus hair is most easily observed on children and adult women, who generally have less terminal hair to obscure it. Vellus hair is not lanugo hair. Lanugo hair is a much thicker type of hair that normally grows only on fetuses.

Vellus hair is differentiated from the more visible terminal or androgenic hair, which develops only during and after puberty, usually to a greater extent on men than it does on women.

The Latin language uses the word vellus to designate "a fleece" or "wool." Vellus hair is sometimes colloquially referred to as peach fuzz, due to its resemblance to the downy epidermic growths on the peach fruit.