Small red bump on gum looks like a pimple?

My stupid cousin confessed she has a small red bump in her mouth I noticed cause she would make stupid faces cause when she moves her top lip it stings her that's how I noticed it looks like a pimple did she get it from sex or kissing ? Or what it's been there she said for 3 days n it just stings when... show more My stupid cousin confessed she has a small red bump in her mouth I noticed cause she would make stupid faces cause when she moves her top lip it stings her that's how I noticed it looks like a pimple did she get it from sex or kissing ? Or what it's been there she said for 3 days n it just stings when it's touched n very small
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