# Which Hair Growth Phase Shrinks the Follicle and Forms a Club Root?

> The answer is catagen. It's the short transitional phase where the follicle shrinks, the hair bulb disappears, and the root forms a rounded club.

Canonical: https://fadejunkie.com/practice/hair-science/catagen-transition-phase  
Last updated: 2026-08-11

**The answer is catagen. It's the short transitional phase where the follicle shrinks and the hair root forms a rounded club shape.**

Catagen sits between anagen (the active growth phase) and telogen (the resting phase), and it's by far the shortest of the three. Androgen isn't a growth-cycle phase at all — it's a hormone — which is why it doesn't belong with the other three answer choices.

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