a hair follicle的用法和样例：
- Inflammation of a follicle, especially of a hair follicle.
- A plug of keratin and sebum within a hair follicle that is blackened at the surface.
- Boil(or furuncle orfurunculosis ): Inflamed pus-filled swelling due to staphylococcus skin infection at a hair follicle.
- inflammation of a follicle,especially of a hair follicle
- Susan just stood and didn't turn a hair.