Noticing a narrow, thread-like bump on the neck can raise questions, especially if it catches on clothing or jewelry. Several skin growths can have a similar appearance, including filiform warts and skin tags. Many are harmless, but a description or photograph alone may not reliably distinguish them. Before trying to remove an unfamiliar growth, have a healthcare professional identify it. Choosing treatment based only on its shape can damage the surrounding skin or delay an appropriate diagnosis.
One possible explanation is a **filiform wart**, which has thin, finger-like projections extending from the skin. These warts commonly develop on the face and can also occur on the neck. Like other skin warts, they are caused by human papillomavirus, or HPV. The viruses responsible for ordinary skin warts can spread through skin contact; a wart in this location does not establish sexual transmission. Picking at a wart or shaving across it can also spread the virus to nearby skin.
Another possibility is a **skin tag**, a soft, benign growth that may hang from a small stalk. Skin tags frequently appear around neck creases and other places where skin, clothing, or jewelry rubs. They are different from viral warts and generally need no treatment unless they become irritated, uncomfortable, or otherwise troublesome. However, other growths can resemble them. A clinician can assess the appearance and history, sometimes using additional examination or testing when the diagnosis is uncertain.