What Are Navel Stones?

An omphalolith – also referred to as an omphalith, omphalokeratolith or umbolith – is a keratin- and sebum-containing stone-like mass found in the umbilicus.1,2 Very few reports of omphaloliths are present in the literature. The development of these masses correlates to poor hygiene and may involve chronic sebum and keratin deposition in the umbilicus that oxidizes into a solid, black accretion.2-4 This is usually not bothersome unless the mass becomes infected, inflamed or ulcerated.3
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