Hair that has begun to look darker in appearance and often grows longer due to stimulation from external or internal causes is described as what?

Hair that has begun to look darker in appearance and often grows longer due to stimulation from external or internal causes is described as what?

• A. Intermediate hair / accelerated vellus hair
• B. Hair shaft
• C. Sycosis
• D. Post inflammatory hyperpigmentation (PIH)

Answer: (A)

This is about how hair is classified by appearance and growth stage. Vellus hair is fine, light, and short. When that fine hair receives stimulation—hormonal changes or external factors—it can darken and grow longer, moving toward a thicker, pigmented state without becoming fully terminal. That intermediate stage, sometimes called accelerated vellus hair, sits between vellus and terminal and is characterized by more pigment and increased length compared to true vellus. So the description of hair appearing darker and longer due to stimulation best fits intermediate hair. It isn’t a hair shaft itself, nor a skin condition like post-inflammatory hyperpigmentation or an infection such as sycosis.

This is about how hair is classified by appearance and growth stage. Vellus hair is fine, light, and short. When that fine hair receives stimulation—hormonal changes or external factors—it can darken and grow longer, moving toward a thicker, pigmented state without becoming fully terminal. That intermediate stage, sometimes called accelerated vellus hair, sits between vellus and terminal and is characterized by more pigment and increased length compared to true vellus. So the description of hair appearing darker and longer due to stimulation best fits intermediate hair. It isn’t a hair shaft itself, nor a skin condition like post-inflammatory hyperpigmentation or an infection such as sycosis.