A small piece of hair fell out on the head, there are a variety of possibilities: 1, spot baldness, mostly related to mental tension, stress, shock and other situations. Relax and adjust your mind, the rash may get better on its own, treatment can be topical with minoxidil solution to promote hair growth; 2, connective tissue disease, need to improve the relevant examination, such as anti-nuclear antibody profile for related exclusion. In addition to hair loss, there will be local changes in the scalp, which will be red, erythema, papules, plaques, etc., which can be judged by professionals. Normally, you should pay attention to rest, relax and not stay up late. Long-term staying up late and mental tension will have an adverse effect on the immune status of the whole body, leading to baldness or other diseases.