How to treat a stubborn cold sore on corner of mouth?

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Corrections to original question:

Rubbing alcohol, not tea tree oil, is credited for helping clear it up the first time. Also the cigarettes are limited to 1–2 per day.

There’s something you’ll find in a drug store or in health and beauty aid section of a store like CVS, it’s called Carmex. It’s just a little pot of probably petroleum jelly based stuff with camphor in it.

“Asking for a friend.” Sure.
At this point, when you have had it so long that you’ve named it, I would go to a doctor to get a prescription.

Ouch! Rubbing alcohol is owie. There is an ingredient in licorice root called glycyrrhizic acid. This has been shown in clinical trials to stop the growth of this type of viral infection. Be careful and use sparingly. Don’t eat it loads of it. I know it tastes like a sugar substitute but it has side effects if you consume it like that. If you can find it in powdered form, mix a pinch of it with some lip balm and put it on the cold sore. If you can’t find it in powered form, try finding it in it’s prepared candy form, but make sure it is labeled containing ‘licorice mass’ or it could be flavoured with anis (cheap brands are, you may only find the ‘real licorice’ in something like a healthfood store.) You can chew on the licorice stick, holding against the corner of your mouth with the sore.

If you can’t find licorice root powder, try Carmex. Also, get a new toothbrush. You could be reinfecting yourself.

Go to a doctor, get a script for Valtrex.

Could it be angular chelitis. Literally sore corner of mouth. It can look a little bit like a cold sore. You could try putting anti fungal cream on it for are days and see if it helps, after that I might be tempted to see a doc.

If it’s a true cold sore, it’s a form of herpes and therefore incurable with a cream or other OTC topical meds. These may only ease the symptoms. I suggest you see a doctor rather than spend money at the drugstore. You can get rid of it, but it’s going to take time and professional help to do it.

Valtrex when it first starts. Now it’s been a couple of weeks and might not do much, but I’d still get a prescription for it, and ask for a refill so if it happens again he can just call up the pharmacy. If it’s the first time this will probably be the longest and worst time.

I was in the dentist office and they had some sort of dental journal magazine in the lobby.
I read an article that said that they had great results with shining an ordinary red laser pointer on the cold sore for, I believe it was 30 seconds. (May have been a minuet. )
The study said there was dramatic results with just one treatment.
My daughter tried it and was also impressed with the results.

@chyna I sense codetta is a woman, and if she has enough facial hair to hide a cold sore I’m going to wonder.

He should get a script for an anti-viral and use a cream or chapstick to keep the corner from drying out and cracking. I’ve had coldsores my whole life and the drugs are really amazing compared to what they used to be. The key is to take the meds early, as soon as he feels the tingle sensation (obviously this is more applicable for future outbreaks).