Pterygium colli is a congenital skin fold that runs along the sides of the neck down to the shoulders. It involves an ectopic fibrotic facial band superficial to the trapezius muscle. Excess hair-bearing skin is also present and extends down the cervical region well beyond the normal hairline.

(pterygium colli) A congenital, usually bilateral, thick web-like fold of skin that extends from the acromion to the mastoid process. This deformity is associated with Turner Syndrome and Noonan Syndrome.