A 39-year-old man was seen by the dermatology service for skin lesions on the back that were compatible with pityriasis versicolor. Physical examination revealed multiple, firm, brownish or normal skin-colored peduncular and/or sessile lesions displaying a unilateral or zosteriform distribution from the gluteal area to the right hemiabdomen (Fig 1). The lesions were asymptomatic and had been present since birth. The patient had no relevant family or personal history. No other pigmentary abnormalities or malformations were observed.
Fig 1.
Figure 1 by Alba Navarro-Bielsa, MD, Paulina Cerro-Muñoz, MD, and Yolanda Gilaberte, PhD, MD.
Lesion biopsy showed abundant mucinous material in the papillary dermis, associated with epidermal hyperplasia with marked elongation of the interpapillary ridges (Fig 2).
Fig 2.
Figure 2 by Natalia Estrada, MD and Carmen Yus, PhD, MD.
What is the most likely diagnosis?
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A.
Verrucous epidermal nevus
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B.
Cutaneous mucinosis of infancy
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C.
Mucinous nevus
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D.
Nevus lipomatosus cutaneous superficialis
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E.
Segmental neurofibromatosis
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Footnotes
Funding: The authors have no funding sources to declare.
Conflicts of interest: The authors have no funding sources to declare.
IRB approval status: Not applicable.