I've started getting cold sores every few days, quite small ones, that don't last long, on my lips, I've now got a few small looking cold sore or blisters on my skin, arms, hip thigh, and quite a large one on my wrist. It all seems to have come on since I upped my mileage in my Great North Run prep and started using SIS Go Gels and SIS Go tabs. I've basically had some sort of cold sore for the past month or so. I seem to remember energy gels having the inside of my mouth blistered a few years ago on a bike ride, but they're not something I've used regularly before.
So, is this actually feasible, and if so, what shall I use instead. Fuel wise, I don't think I'm dependent on them, although I'm not sure as I'm slow so 13 mile is going to take me well over two hours, but I certainly rely on them as part of my routine in my longer runs to break things up,
(*Having a cold sore is not in itself unusual, usually get one a year)