Patchy baldness hair loss for about 1 to 2 months to the resting phase, usually in the resting phase when the hair loss area edge hair is no longer loose. Pemphigus vulgaris is a non-scarring hair loss disease that can occur in any part of the body where there is hair. The cause of the disease is still not completely clear, and it is currently believed that it may be related to mental and emotional stress, endocrine disorders, immunoinflammation and other factors. Usually, according to the stage of the disease, baldness can be divided into the progressive stage, stationary stage and recovery stage. The hair at the edge of the hair loss area in the progressive stage is loose and can be easily pulled out, and the proximal part of the hair shaft of the hair that is pulled out is atrophied, which is exclamation mark-like with the upper thick and lower thin, and the hair in the stationary stage will no longer be loose and will be recovered in 3-4 months, and there will be new hairs growing out. Usually after diagnosis of baldness, you can go to the dermatology department of the regular hospital, follow the doctor’s instructions to clarify the diagnosis, reasonable treatment, improve the symptoms and control the condition.