Pigmented Onychomatricoma: Clinical and Dermoscopic Findings in a Series of 29 Cases.

StudySkin appendage disorders· Aug 2026

Pigmented Onychomatricoma: Clinical and Dermoscopic Findings in a Series of 29 Cases.

Adriana Matter, Nilton Gioia Di Chiacchio, Jorge Ocampo-Garza … Nilton Di Chiacchio

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Hair & NailStudyDiagnosisQ2IF 1.5

Pigmented onychomatricoma shows a consistent pattern of longitudinal melanonychia, nail thickening and distal free-edge cavities in a 29-patient series.

Pigmented Onychomatricoma: Clinical and Dermoscopic Findings in a Series of 29 Cases.

Adriana Matter … Nilton Di Chiacchio

Skin appendage disorders · Aug 2026 · Q2 in Dermatology

Background

Pigmented onychomatricoma is a rare benign fibroepithelial tumor of the nail matrix that may clinically simulate subungual melanoma and other pigmented nail disorders.

Methods

We retrospectively reviewed 29 patients with histopathologically confirmed pigmented onychomatricoma treated between 2015 and 2024.

n = 29 patients

Results

89.7%

of tumors showed distal free-edge cavities on dermoscopy, the most frequent dermoscopic finding

n = 29 patients

More results

Seventeen patients were men (58.6%) and twelve were women (41.4%), with a mean age of 54 years (range 31-71 years).

Fitzpatrick phototype IV predominated (58.6%).

Longitudinal melanonychia was present in all patients (100%).

More results

Toenails were more frequently affected than fingernails (58.6% versus 41.4%), and the hallux was the most commonly involved digit (31%).

“

Conclusion · 1 of 2

Pigmented onychomatricoma demonstrates a consistent clinical and dermoscopic profile characterized by longitudinal melanonychia associated with nail thickening, characteristic distal cavities, and increased transverse curvature.

Conclusion · 2 of 2

Recognition of this constellation of findings is essential for differentiation from subungual melanoma and other pigmented nail tumors.

Pigmented Onychomatricoma: Clinical and Dermoscopic Findings in a Series of 29 Cases.

Pigmented Onychomatricoma: Clinical and Dermoscopic Findings in a Series of 29 Cases.

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