Normally 1 hair grows in 1 follicle, but occasionally you may see 2 hairs in 1 follicle. If multiple hairs are seen in 1 hair follicle, it may be a cluster of multiple hair follicles together forming a hair follicle, usually no more than 4 hairs. If the follicular hair is in a disease state to be analyzed specifically. The disease state of follicular hair is mainly divided into: anagen, alopecia and polytrichosis. Hairlessness or hypotrichosis is generally a genetically inherited mutation in the hair gene, a condition in which there is no hair in the hair follicle or very little hair in the follicle, which can result in total or universal baldness. Hypertrichosis is a condition in which one hair follicle produces 4-8 hairs, mostly due to dysplasia of hair follicles, mostly in the beard area, and in children, mostly on the scalp. Hair traits are related to genetics, health conditions, hormone levels, climate, medications and other factors, so you must pay attention to hair follicle hair care and seek medical attention as soon as possible for hair follicle hair disorders.