Vellus hair is one of two types of body hair. They are defined as fine, short, soft and usually have no color (non-pigmented) or are only lightly pigmented. Vellus hairs cover the majority of the body. Androgens (“male” sex hormones) can turn vellus hairs turn into the thicker, darker and more rigid terminal hairs.
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- Medscape. How are vellus hair and terminal hair differentiated in the evaluation of hirsutism? https://www.medscape.com/answers/121038-114774/how-are-vellus-hair-and-terminal-hair-differentiated-in-the-evaluation-of-hirsutism (accessed 7. August 2020)