A hair left in the follicle may be a normal phenomenon, seborrheic alopecia, seborrheic alopecia can be recovered through timely treatment with medication. 1. Normal phenomenon: a single hair follicle in the scalp can contain one to three hairs, as long as the proportion of hair follicles containing one hair is not high, it is a normal phenomenon, no need to deal with it. 2. Seborrheic alopecia: Seborrheic alopecia is also called androgenic alopecia, related to heredity and androgen, which can lead to the miniaturization of hair follicles and increase the proportion of hair follicles containing one hair, and active treatment can improve the symptoms, such as topical tincture of minoxidil, oral finasteride, etc., which can be improved through active treatment. If the patient’s hair loss symptoms are serious, should go to the hospital in time for treatment, the specific use of drugs need to follow the doctor’s instructions.