velluses

Velluses are small, thin hairs that are present on the skin. They are a type of vellus hair that is typically found over much of the body and are an essential part of human hair diversity. Vellus hairs are often transparent or light in color and are usually less than 2 centimeters in length.

Velluses are distinct from terminal hair, which is thicker and coarser. Unlike terminal hair, vellus hairs are not visible to the naked eye, except when pulled. They serve various purposes, including providing a thin layer of insulation, regulating body temperature, and protecting the skin from external irritants and abrasions. The presence of vellus hair on the skin also helps to modulate the direction of airflow and temperature differences across the skin surface.

Research indicates that the density and amount of vellus hair on the body may be linked to factors such as age, sex, and genetics. For example, people with higher levels of androgens, such as males, tend to have lower levels of vellus hair, especially on the back and face. Furthermore, vellus hair may be somewhat less prevalent in individuals of European descent compared to those with African or Asian ancestry.

Vellus hairs are also of interest in the context of clinical conditions. For example, in poliosis, a condition characterized by premature graying, individuals may experience a significant reduction in the amount of vellus hair on the body. It is essential to recognize the diversity and function of vellus hair across different populations and consider the effects of various health conditions on their presence and distribution.