From dermoscopedia

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 Authored by: Luc Thomas

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Author(s) Luc Thomas
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Status update June 25, 2018
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Dermoscopic features of onychopapilloma[1] do not differ much from those observed in other epithelial tumors of the nailThis glossary term has not yet been described. matrix (i.e. squamous cell carcinomaThis glossary term has not yet been described., onychomatricoma and seborrheic keratosisThis glossary term has not yet been described.). However, in onychopapilloma, the width of the yellow-white band with occasional splinter hemorrhages and some polychromia is much smaller and demarcation with surrounding uninvolved nail plate is sharp and parallel. Moreover, the subungual hyperkeratosis is also extremely limited and produces a kind of hyperkeratotic spine underneath the nail plate that the patient has usually noticed and which is painful. Occasionally, bleeding occurs during attempts to trim it while cutting off the nail distal edge.

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  1. 24 Criscione V, Telang G, Jellinek NJ. (2010) Onychopapilloma presenting as longitudinal leukonychia. J Am Acad Dermatol 63(3): 541–2.