The black dots at the root of the plucked hair are not hair follicles but hair bulbs, the follicles are on the skin and the bulbs are at the ends of the hair. 1. Hair follicle: Hair follicle exists in the skin, located in the dermis and subcutaneous tissue, is the structure of hair growth. There are three layers of structure, the inner hair root sheath, the outer hair root sheath, and the connective tissue sheath. The hair follicle is the most important structure for hair growth, and when the hair follicle shrinks there is no more hair growth. 2. Hair bulb: Hair bulb is the place where hairs are more active, the hemisphere wrapped around the root of the hair is the hair matrix, the place where the hair grows upwards and where the melanocytes grow and are responsible for providing pigment to the hairs. Ordinary hair loss generally does not lead to follicular atrophy drops, so patients do not need to worry.