very fine, soft, usually short, non-pigmented hair found on the face, body or even a baby's head is called "vellus hair," and is not targeted with laser hair removal procedures.
Fine colorless short hair covering most of the body surface. Vellus hair replaces lanugo shortly after birth and may be transformed into terminal hairs under the influence of androgens. In people with Androgenetic Alopecia vellus hairs replace terminal hairs. Vellus hairs lack a central medulla which accounts for their fine and colorless appearance.