Adnexal polyp of neonatal skin is a small, skin-colored papule that occurs most frequently on the areola of the nipple in newborns. The incidence is reported to be 0.7% in the Czech Republic and 4% in Japan. The frequency of adnexal polyps in other ethnic groups have not been studied.
Adnexal polyps are usually single, but the presence of more than one has been reported. They usually become desiccated and brown before falling off spontaneously within a few days of life, but rarely they can persist until early childhood, up to the age of 7. They are not associated with underlying syndromes or diseases.
Adnexal polyp of neonatal skin
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Synopsis
Codes
ICD10CM:
P83.88 – Other specified conditions of integument specific to newborn
SNOMEDCT:
239096008 – Neonatal adnexal polyp
P83.88 – Other specified conditions of integument specific to newborn
SNOMEDCT:
239096008 – Neonatal adnexal polyp
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Differential Diagnosis & Pitfalls
- Supernumerary nipple – A small, pink or brown papule found along the mammillary line of newborn infants. Supernumerary nipples persist throughout life and may develop prominent hair or enlarge during puberty. Histology resembles that of a normal nipple, with epidermal thickening, papillomatosis with basal hyperpigmentation, lactiferous ducts, and occasionally underlying breast tissue.
- Accessory auricle – Accessory appendage composed of skin, subcutaneous fat, and cartilage that occurs near the auricle, buccal area, or along the sternocleidomastoid muscle in the newborn. Lesions are skin-colored and may be pedunculated, dome shaped, or nodular. Accessory auricles extend deep into the subcutaneous tissue and do not fall off spontaneously. Excision demonstrates a cartilage root at the base of the lesion.
- Acrochordon or skin tag – Presents as a small, skin-colored, pedunculated papule that is commonly acquired during adulthood and rare in infancy. There are typically multiple lesions located on the neck, axilla, or groin. Adnexal structures are absent histologically.
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Last Reviewed:07/12/2020
Last Updated:07/26/2020
Last Updated:07/26/2020