It could be causing the problem, the blister will be caused by rubbing somewhere anyway at least. And don't feel stupid, at least it'll be sorted. 
And different brands can fit slightly differently as well, I've even had two models from Adidas that I wear in different sizes!!

And different brands can fit slightly differently as well, I've even had two models from Adidas that I wear in different sizes!!



surely this can't be the case, I foam rolled it last night extra hard so maybe it's just a bit of DOMS in the muscles round there... please?