In recent years, anti-aging, health and beauty, cosmetic and hair diseases attract attention. In particular, the hair has been very important in determining the human appearance. It is hoped that the formation mechanism in the root of hair will be clarified. However, it is difficult to observe the growth in root of hair and detailed mechanism has not yet been elucidated. Hair repeats growth and retraction, pause cycle (hair cycle) with a constant cycle. In the growth phase, hair is formed through processes of cell proliferation and differentiation (keratinization). During the regressive period, hair growth stops, and in the resting period it is said to be a period until hair comes out and new hair grows. It is believed that this hair cycle affects the elongation rate, thickness, strength and shape of hair. Therefore, in this study, we introduce a particle model as a new method to elucidate the process of unknown hair formation, and model the hair formation process accompanying the proliferation and differentiation of cells in the hair root part in the three-dimensional region. In addition, not only the growth period, but also the regression period and the resting period are introduced to realize the hair cycle using this model.
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