Severe hair loss should be seen by a dermatologist. Before seeing the doctor, you need to do relevant tests, such as checking the immune status, checking the T-cell subpopulation as well as micronutrients, to see if the body has any corresponding lesions. And need to do skin CT, to see whether the hair loss follicle destruction is serious, and then take the appropriate treatment. In the case of medication, you can apply topical medications, such as minoxidil tincture or calcium-modulated phosphatase inhibitors, such as tacrolimus ointment or pimecrolimus cream. In addition, you can also take oral treatment of traditional Chinese medicine, such as Jingwu capsule, or oral treatment of Western medicine compound glycyrrhizin tablets, and at the same time to maintain a happy mood.