Acyclovir is an antiviral drug, so Acyclovir Ointment is mainly used to treat viral infections. Acyclovir ointment can be used to treat male genital edema caused by viral infections, while other causes of genital edema caused by the use of Acyclovir ointment is ineffective. 1. The causes of male genital edema are many, mild trauma can reduce the swelling by itself, the foreskin inlaid caused by the person in the reset can be recovered by itself, bacterial infections can reduce the swelling after giving amoxicillin and other antibacterial drugs, fungal infections can be given ketoconazole cream and other antifungal treatment can reduce the swelling. Acyclovir ointment has no therapeutic effect in these cases. 2. genital herpes in addition to genital pimples, blisters and ulcers and other symptoms, some patients may also appear genital edema, and acyclovir ointment belongs to the antiviral drugs, the clinical use of acyclovir ointment can be used for the treatment of genital herpes caused by genital edema. Acyclovir ointment common adverse reactions are mild pain, itching and rash, etc., for the drug ingredients allergy is prohibited to use, in the use of the period to pay attention to can not be used in the eyes, the emergence of the above adverse reactions to discontinue use in a timely manner. It is recommended that patients go to the regular hospital to improve the auxiliary examination, in order to clarify the cause of the disease after treatment, the drug needs to be used under the guidance of a professional physician.