Pemphigus vulgaris is always recurring, and it is considered to be related to neuropsychiatric factors, immunologic factors and infectious factors. 1. Neuropsychiatric factors: there are more reasons for the recurrence of pemphigus vulgaris, among which neuropsychiatric factors have an important association with the recurrence of pemphigus vulgaris. Pemphigus vulgaris can be triggered by mental stress, such as tension, anxiety, depression, etc. If the recent mood is poor and stress is high, it may lead to recurrence of pemphigus vulgaris. 2. Immune factors: the destruction of the immune immunity mechanism of hair follicles is the key to the occurrence of baldness, and if the patient’s own resistance is low, it may lead to recurrent episodes of baldness. 3. Infection: If infection occurs in the body recently, such as herpes zoster, influenza and other diseases, it will lead to a decline in the body’s immunity, thus inducing spot baldness. There are more reasons why spot baldness keeps recurring (such as endocrine disorders, etc.), so it is recommended to consult a doctor for examination and clear diagnosis.