Well... that was bad timing.
Just sat down munch on a sandwich and opened this.
I have had a few of these over the years, which seem to appear in similar circumstances, eating/drinking.
I ran it past my doctor and he said it's similar to a blood nose, blood vessels bursting under the skin causing the blister.
There was no serious underlying cause in my case, but if it concerns you mate, best to ask your GP to be on the safe side.
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