Pigmentation of the skin is a characteristic common to the three entities—pseudoatrophoderma colli, acanthosis nigricans, confluent and reticular papillomatosis— whose names partially identify the disease processes. The pigmentation is mottled in the first, confluent in the second, and confluent and reticulated in the third disease. Recently the name pseudoacanthosis nigricans has been suggested for what appears to be acanthosis nigricans in obese patients and for some cases of confluent and reticular papillomatosis. It has been suggested that pseudoatrophoderma colli might be a type of confluent and reticular papillomatosis and the latter a form of acanthosis nigricans.
This is an attempt to clarify a most vexing and confusing problem and to circumscribe our terminology.
The salient literature on the three entities will be reviewed. Colleagues have furnished the photographs and records of pseudoatrophoderma colli, an entity which apparently has not been
KESTEN BM, JAMES HD. Pseudoatrophoderma Colli, Acanthosis Nigricans, and Confluent and Reticular Papillomatosis. AMA Arch Derm. 1957;75(4):525–542. doi:10.1001/archderm.1957.01550160051007
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