Nearly all the skin of the human body, except for the palms of the hands and soles of feet, is covered with hair. We are born with all the hair follicles we are ever going to have, and these follicles normally continue to produce hairs throughout our lives. Following are a few hair types:
Secondary hairs: The stiff, short, bristly hair of the eyelashes and brows, and can also be found inside the nose. The function of secondary hair is protection. For the eyelashes, to prevent foreign objects from entering the eye. Eyebrows serve to divert liquids (sweat) from the eyes and communication gestures.
Vellus hairs: Also called "fuzz." They are short, fine, light colored or colorless, and barely noticeable found on children and adults. The growth of vellus hair is not affected by hormones
Terminal hairs: Thick, coarse, long, and dark compared to vellus hair. During puberty, the increase in androgenic hormone levels causes vellus hair to be replaced with terminal hair in certain parts of the human body. The human body, including the face, will have different levels of sensitivity to the male hormone, androgen.