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What's this zit thing on the outside of my vagina?

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I have this thing that looks like a zit with a whitehead on the outside of my vagina. Can anyone help me out what it is? I've never done anything sexual before so I dont know what it could be. The only thing that has happened is a boy put his finger in me for a couple seconds by accident [long story] about 3 or so weeks ago. I havent noticed it till tonight.