Thermazene for cold sores

My husband is a Boilermaker and has Thermazene on hand since burns are almost routine.

He heard from someone that it was also great for cold sores...is that true???

I hope so because I felt one coming on and tried it! Please reply asap!

Also,he keeps it in the fridge,the nurse at the hospital said to store it there, but I read that it should be kept at room temp.

Thank you kindly,

~*Mrs.Murphy