Pimple on lip after oral sex? is he cheating on me?

Anonymous
ok me and my boyfriend are together one and a half year now. and for the first time I get a single pimple on my lip about an hour after I goes down on me..why? is that a sign that he is cheating on me or it could be something else that can causes this pimple?
Pimple on lip after oral sex? is he cheating on me?
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