👉 A trichogenous is a type of hair growth that occurs in the scalp. It is characterized by the presence of many hair follicles, each with its own hair shaft and hair follicle. This can lead to an uneven distribution of hair, which may be caused by hormonal changes or other factors. Trichogenous hair growth is often associated with certain medical conditions such as alopecia areata, psoriasis, and dandruff.