Familial supernumerary nipples

Familial supernumerary nipples, also known as familial polythelia, is a congenital condition characterized by the presence of one or more additional nipples (accessory nipples) beyond the normal two. These extra nipples typically appear along the embryonic mammary ridge (milk line), which extends from the axilla (armpit) to the groin on both sides of the body. In the familial form, the condition clusters within families and follows a hereditary pattern. Supernumerary nipples may range from a small, barely noticeable mark resembling a mole to a more fully formed nipple, sometimes with surrounding areolar tissue. In rare cases, accessory breast tissue (polymastia) may also be present beneath the extra nipple. The condition primarily affects the skin and soft tissues of the chest and abdominal wall. Supernumerary nipples are usually asymptomatic and are often discovered incidentally during physical examination. They are generally considered a benign finding; however, in some cases, accessory nipples with underlying breast tissue may undergo hormonal changes (such as swelling or tenderness during puberty, menstruation, or pregnancy). Rarely, accessory breast tissue may be subject to the same pathological conditions as normal breast tissue, including benign tumors or, very rarely, malignancy. Some studies have suggested associations between supernumerary nipples and renal or urogenital anomalies, though this association remains debated in the medical literature. Treatment is generally not required unless there are cosmetic concerns or complications. Surgical excision can be performed for cosmetic reasons or if the accessory nipple causes discomfort or is associated with underlying glandular tissue that becomes symptomatic. Genetic counseling may be offered to affected families to discuss the hereditary nature of the condition and its generally benign prognosis.

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