Antiviral drugs should be applied
a. at the first symptom of a cold sore.
b. at the end of the itching phase.
c. when the ulcers become crusty.
d. when the ulcers disappear.
a. Antiviral drugs should be applied at the first symptom of a cold sore; best before it appears. At the end of the itching phase, or when the lesion becomes crusty it is too late to apply medications.
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