A bald patch at the back of the hair is considered to be a high probability of spot baldness, the etiology of spot baldness is not completely clear, and it is considered to be related to autoimmunity. However, if baldness occurs, it is better to exclude whether there is anemia, blood sugar abnormality, thyroid function abnormality, micronutrient deficiency, liver and kidney function abnormality or connective tissue disease. If the above results are not abnormal, spot baldness can generally be recovered within 3-6 months, do not be overly nervous and worried, pay attention to adjusting emotions, avoid stress and anxiety, do not stay up late, ensure quality sleep, so as not to lead to an increase in the aggravation of spot baldness, the formation of generalized baldness or total baldness. At the same time, you can give oral cystine tablets, vitamin B complex, local can be used externally minoxidil tincture, you can also choose Chinese medicine plum blossom needle treatment, promote the growth of hair.