A hair follicle goes through three stages of growth: the anagen phase, the catagen phase, and the telogen phase. The anagen phase is the active growth phase, during which the hair follicle is actively producing new hair. This phase can last for several years.
The catagen phase is a transitional phase during which the hair follicle begins to shrink and the hair shaft becomes detached from the follicle. This phase lasts for a few weeks.
The telogen phase is the resting phase, during which the hair follicle is dormant. This phase can last for several months.
After the telogen phase, the hair follicle re-enters the anagen phase and the process of hair growth begins again.
So, a hair follicle becomes dormant during the telogen phase, which can last for several months.
