fyi -zovirax ointment is prescription in most countries.
just because applying a topical works, doesn't mean it's a cold sore either. Many things will clear up with just the base cream that the zovirax is in.
grace
Cold sores are caused sually by the herpes simplex1 virus.
The best way to find out is buy some zivorex from the over the counter pharmacist, and put it on and see if it goes down.
Did you get any tingling in the area before the sore appeared?
If the cream works, then its probably a cold sore. and the next time one appears if ever, use the cream as soon as you feel the strange tingling sensation before the blister comes out.
If the cream doesnt work, then it probably not a coldsore.
Its hard for me to say without seeing it, but this is the best of my knowledge.
Hope this helps
Take care
Nicola
the only way to know is to be seen and get a lesion culture done on this. it's best done within 48 hours of the appearance of symptoms.
grace