![]() It is difficult to find hair in a trichogram during the catagen phase. The catagen phase represents the moment in which the follicle starts to diminish and slowly ceases mitosis. It is recognized that for men it usually lasts 2-4 years, while for women 3-6 years. The duration of the anagen phase differs between men and women. The first five sub-phases last for a very short period of time and consist of the proliferative phase, while the sixth phase is the longest, and is characterized by a phase of differentiation. There are six sub-phases in the anagen phase. With regards to the different lengths of the various phases of the hair growth cycle and in normal conditions, hair in the anagen phase represents 80-90% of the total, that in the catagen phase 1% and that in the telogen phase 10-20%.
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