Sudden baldness in children should be examined in time to clarify the cause of the disease, and there are many reasons, such as genetic factors, immune factors, psychological pressure and so on. Patch baldness is a common hair loss disease, and there is no need to be too nervous and anxious after the appearance of patch baldness, and follow the doctor’s instructions to standardize the treatment can be. 1. Genetic factors: For example, if parents have baldness, children may suddenly develop baldness. 2. Immune factors: Pemphigus vulgaris is often associated with one or more autoimmune diseases, such as Hashimoto’s thyroiditis, diabetes mellitus, vitiligo, etc. Therefore, if pemphigus vulgaris occurs, you should complete the examination and make sure that there are autoimmune diseases. 3. Psychological stress: for example, children’s psychological stress, mental tension, depression, etc., may also induce the phenomenon of sudden baldness. Children with sudden baldness need to go to the hospital in time for examination and standardized treatment according to the doctor’s instructions after clarifying the cause of the disease.