Which of the following is NOT a phase of hair growth?

The phases of hair growth are essential concepts in understanding how hair behaves and grows, and any terminology used must accurately reflect those phases. Anagen, catagen, and telogen are all recognized stages in the hair growth cycle.

Anagen is the active growth phase where the hair follicles produce new strands, leading to the hair lengthening. During this phase, hair can grow quickly, and it can last from several years to a decade, depending on genetics and other factors.

Catagen is the transitional phase that follows anagen, during which the hair stops growing and prepares to enter the resting phase. This phase lasts a few weeks, and it allows the hair to detach partially from the hair follicle.

Telogen is the resting phase where the hair is not actively growing. During this time, hair can naturally shed as new hair begins to develop, taking its place when re-entering the anagen stage.

Exogen is a term sometimes used within discussions of hair growth, referring to the shedding phase when hair is released from the follicle, but it is not classified as one of the primary phases of hair growth in the same way the other three phases are. This distinction is crucial, as understanding the formal stages helps in hair care practices and addressing