What is the lifecycle phase where hair grows actively?

The lifecycle phase where hair grows actively is known as the anagen phase. During this phase, hair follicles are in a state of active cell division, which results in the hair shaft elongating and growing. This phase can last for several years, depending on various factors such as the individual's genetics and overall health. The longer the hair remains in the anagen phase, the longer it can grow, contributing to the length of the hair we observe.

In contrast, the telogen phase is the resting phase, during which hair does not grow, but rather stays attached to the follicle until it eventually sheds. The catagen phase is a transitional phase, marking the end of active growth, where the hair follicle shrinks and detaches partially from its blood supply. The resting phase of hair is a period of dormancy before the hair is shed and new hair begins to grow again in the next anagen phase. Understanding these phases is crucial for estheticians, as it affects the effectiveness of treatments and the overall health of hair.