Side effects are possible but rare.
Dry the area well before applying the anesthetic ointment, and apply no more than four times per day.
Anesthetic ointments can help relieve the pain that may be associated with a cold sore outbreak. Benzocaine (Americaine Topical Anesthetic, Lagol) is an example.
Anesthetic ointments work by numbing the area of the cold sore.
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