Which phase of hair growth is characterized by active growth?

The phase of hair growth characterized by active growth is the Anagen phase. During this phase, hair follicles are actively producing new hair cells, leading to hair lengthening. This phase can last for several years, depending on individual genetics and other factors, contributing to the overall length of hair.

The Anagen phase is distinguished by the presence of rapid cell division and high metabolic activity within the hair follicle, leading to substantial hair growth. In contrast, the Telogen phase is a resting phase where hair does not actively grow but remains attached to the follicle for a period of time before shedding. The Catagen phase represents a transitional stage where the hair stops growing, and the follicle begins to shrink, preparing for the shedding of the hair. Erythema, however, refers to redness of the skin due to increased blood flow and is not related to hair growth cycles.