Antecedent Joke

I often complain about questionable antecedents being the bugbear of pronouns. Well, it can happen with prepositional phrases, too.

The Skin Doctor
https://www.buttersafe.com/2019/11/05/the-skin-doctor/

A part of good writing is thinking how you might be misunderstood, then preventing the misunderstanding. So how would you rewrite the statement in the first panel so the person with the mole wasn’t ambiguous?