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    Acyclovir cream is used to treat cold sores (fever blisters; blisters that are caused by a virus called herpes simplex) on the face or lips.

    Topical acyclovir comes as a cream and an ointment to apply to the skin. Acyclovir cream is usually applied five times a day for 4 days. To use acyclovir cream, follow these steps:

1. Wash your hands.
2. Clean and dry the area of skin where you will be applying the cream.
3. Apply a layer of cream to cover the skin where the cold sore has formed or seems likely to form.
4. Rub the cream into the skin until it disappears.
5. Leave the skin where you applied the medication uncovered. Do not apply a bandage or dressing unless your doctor tells you that you should.
6. Wash your hands with soap and water to remove any cream left on your hands.
7. Be careful not to wash the cream off of your skin. Do not bathe, shower, or swim right after applying acyclovir cream.
8. Avoid irritation of the cold sore area while using acyclovir cream.

(Adopted from: https://medlineplus.gov/druginfo/meds/a606001.html)

It is useful for ____ disease.