Laser Technician (International Board of Electrologist Certification) IBEC Board Exam

If a vellus hair has transitioned to terminal hair, how long is it before it can revert back to vellus hair?

1. 6 months

2. Never

3. 1 year

4. It can revert upon further hormonal changes

The correct answer is: Never

In the context of hair growth and development, vellus hairs are fine, light-colored, and typically shorter hair that covers much of the human body. Terminal hairs, on the other hand, are thicker, darker, and coarser, commonly found on the scalp, face, and body during puberty. When a vellus hair transitions to terminal hair, it indicates a change in the hair’s growth cycle, largely influenced by hormonal factors. Once a hair becomes terminal, it generally does not revert back to the vellus state. This transition is often irreversible due to the significant changes in the follicle structure and hormonal environment that led to the production of terminal hair. Thus, asserting that a vellus hair that becomes terminal can revert back to vellus hair is inaccurate. While hormonal fluctuations can affect hair growth, the already transitioned terminal hairs will remain so unless subjected to specific medical interventions or conditions that dramatically alter the hormonal landscape. Therefore, the understanding is that terminal hair, once formed, maintains its characteristics and does not revert back to vellus.