mouthal

of or pertaining to the region of the mouth

His fever blister was oozing in the mouthal area.

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mouthal herpes

Herpes of the mouth. Not to be confused by oral herpes, which is entirely different, obviously.
Its main source of distribution is the swapping of generally similar looking bottles.

Sue: Hey Sam, I may have misappropriated my bottle and it looks like yours.

Sam: Oh no, perhaps you now have mouthal herpes. That is not fun.