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What's flat or inverted nipples?
Inverted nipples are nipples that points inward or lie flat, rather than pointing out. It's also called retracted nipples. It can happen in one Breast or both, you can be born this way.
Grades of nipples inversion are divided into 3 part
Grade 1: the nipples can easily be pulled outward, and sometimes stand out on its own with cold or stimulation.
Grade 2: the nipple can be pulled outward but it quickly goes back to it's original shape.
Grade 3: the condition is most severe, you may not be able to pull the nipple out at all
2) Born with inverted nipples
3) mammary duct ectasia
4) breast cancer or injury nd etc
Get flat nipples correctors device for yourself to correct it at early stage.