Patchy baldness can be treated with injections. Pemphigus vulgaris is a psychogenic factor-led, autoimmune-related, non-scarring hair loss skin disease, the etiology of which has not yet been fully clarified, and may be related to a variety of factors such as heredity, mental and emotional stress, endocrine disorders, and immuno-inflammatory disorders. Typical manifestation is the sudden appearance of patchy hair loss, the affected skin is smooth, without inflammation, scales and scarring. Treatment is based on medication, and glucocorticoids can be injected into the bald area to reduce perifollicular inflammation, i.e., injections can be made intradermally with trimethoprim injection or compound betamethasone injection. In addition, topical minoxidil solution or halometasone cream can be used, together with oral prednisone, compound glycyrrhizin tablets and other drugs to promote hair growth; photoelectricity can also be used to assist in the treatment of pemphigus vulgaris, such as excimer laser, ultraviolet light irradiation, photodynamic therapy and so on. It is recommended that patients with pemphigus vulgaris should seek medical treatment, and the doctor should choose the appropriate treatment plan according to the condition, and the medication should be strictly in accordance with the doctor’s instructions. If the medication produces uncomfortable symptoms, you should consult a doctor in time.