How to treat my cold sore?

I've had a cold sore on the side of my lip for probably like 3 weeks now. I've never had a cold sore last this long before. About a week ago i purchased a cream for cold sores about a week ago and i have been applying it but i dont know how much it's helping. A few days ago it got to a point where it didnt really even look like a cold sore, but more like cuts from biting my lip or something. I couldnt really open my mouth wide otherwise the cuts would open and it would start hurting. I started putting vaseline instead of the cream to heal the cuts and it has worked a bit but i still cant fully open my mouth comfortably without a bit of stinging. What should i do? Should i continue applying the cold sore cream or put vaseline?