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An inverted nipple (occasionally invaginated nipple) is a condition where the nipple, instead of pointing outward, is retracted into the breast. In some cases, the nipple will be temporarily protruded if stimulated, but in others, the inversion remains regardless of stimulus. Women and men can have inverted nipples. ==Causes== The most common causes of nipple inversion include: * Born with condition * Breastfeeding * Trauma which can be caused by conditions such as fat necrosis, scars or it may be a result of surgery * Breast Sagging, Drooping or Ptosis * Breast cancer including breast carcinoma, Paget's disease and Inflammatory Breast Cancer (IBC) * Breast infections or inflammations such as mammary duct ectasia, breast abscess or mastitis * Genetic variant of nipple shape such as Weaver syndrome, Fryns-Aftimos syndrome, Chromosome 2q Deletion or congenital disorder of glycosylation type 1A & 1 L or Kennerknecht-Sorgo-Oberhoffer syndrome * Gynecomastia〔(【引用サイトリンク】title=Causes of Inverted Nipples )〕 * Holoprosencephaly, recurrent infections, and monocytosis * Pregnancy * Tuberculosis〔(【引用サイトリンク】title=Inverted Nipples/ Nipples Retraction: Causes and Correction )〕 Around 10–20% of all women are born with this condition.〔(【引用サイトリンク】title=Inverted Nipples )〕 Most common nipple variations that women are born with are caused by short ducts or a wide areola muscle sphincter. Inverted nipples can also occur after sudden and major weight loss. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「inverted nipple」の詳細全文を読む スポンサード リンク
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