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There can be a few reasons why:

Maybe your breast muscles are tightening

or if you can a lumo/bump on your breast that can be serious so if you do go get a mammogram done to make sure there can't be a tumor developing!

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13y ago
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13y ago

If you're a dude then it's most likely puberty but if your a woman you might wana get a pregnancy test

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Wiki User

13y ago

its a nipple erection

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