Erythromycin ointment is a topical drug, which is often used to treat all kinds of impetigo. At the same time, for simple vulvitis, erythromycin ointment can also be used for local smear treatment. Although the skin of female vulva is delicate, there is no obvious irritation after using erythromycin ointment, so it can be used with confidence. Moreover, the service period is usually 7 days, and it should not exceed 10 days at most. If 10 day is not effective, further examination is needed to rule out other diseases.