Erm

I think My cats been stung in the mouth by a wasp,
He was playing on the windowsill heard a buzzing then a crash then he was sat on the landing blinking like he was bracing himself,

He blatantly blames me for it he keeps running away
what should I do ? He seems ok just a bit worried about people touching his face

Oh no!!, poor little guy!

A couple of things you need to be very wary of. If he was stung in the mouth, it could be so painful for him that he stops eating and drinking..which would lead to dehydration.

Or the bite could become infected (very swollen, hot to the touch).

If any of this is the case, I'd say you should go to the vets office.

Best of luck and keep us up to date!