Have this ghastly coldsore above my lip most months so can identify with you eash as immune system is challeged. Find Zovirax + Aloe Vera Moisturising Gel helpful in erradicating the cold sore. Also, try to boost immune system with eating healthily + lots of green teas. Purdeys is quite good, too. Yes, all kinds of reasons for these to appear including the weather. Yet, when the weather is ghastly + one of these appears it really is miserable. It is not embarrasing + you only catch it from kissing. It is just annoying to have them + not very pretty either. Hope yours disappear soon eash + Den.
Take excellent care + good luck, Bea :-)