"But they do say that this same Scarlet Pimpernel is mightily ill-favoured, and that's why no one ever sees him. They say he is fit to scare the crows away and that no Frenchy can look twice at his face, for it's so ugly, and so they let him get out of the country, rather than look at him again."
The Elusive Pimpernel, chapter 4
Interesting idea, isn't it? Only.......... I don't think that Chauvelin or any of his colleagues would find that a good enough reason to not try to catch the Scarlet Pimpernel; some of the revolutionaries are probably mightily ill-favored too. And as to the real man....... Maybe the reason why they want to catch him is so that they can see a good-looking face for once. :P