A bald spot on the scalp may be caused by pemphigus vulgaris, seborrheic dermatitis, androgenetic alopecia, etc. It is necessary to take appropriate treatment for the cause of the disease, such as medication, surgical treatment, and general treatment. 1. Pemphigus vulgaris: Pemphigus vulgaris can lead to baldness in one area of the scalp, and the patient can be injected with local glucocorticosteroids, such as betamethasone, dexamethasone, etc. Topical minoxidil can also be used. You can also use topical minoxidil, which has the effect of dilating blood vessels and can promote hair growth. Daily rest, avoid mental stress. 2. Seborrheic dermatitis: If seborrheic dermatitis leads to a bald spot on the scalp, the treatment is based on the dissolution of lipids, keratin exfoliation, and itching, can be used externally and selenium disulfide lotion, salicylic acid and other drugs. Daily to maintain a regular life, sleep enough, eat less spicy and stimulating food. 3. Androgenetic alopecia: androgenetic alopecia can also lead to patients with a bald spot on the scalp, patients can take oral finasteride, spironolactone and other medications, but also can be used externally minoxidil, to promote hair growth. If necessary, choose hair transplantation, can improve the beauty. All of the above drugs should be used in accordance with medical advice. For patients with a bald spot on the scalp, it is recommended to consult a doctor in time and standardize the treatment under the guidance of the doctor.