Dermoscopic Characteristics of Benign Diagnoses at Special Sites
| Diagnosis (Level 1 or 2) Feature included as a learning objective (>70% positive responses) | Round 1: % Positive Responses* (n = 33) | Round 2: % Positive Responses* (n = 30) |
|---|---|---|
| Subungual hemorrhage (level 1) | ||
| Well-circumscribed red-black dots or blotches/blood spots | 90.9% | — |
| Discontiguous with the cuticle (not connected to the proximal nailfold or edge of nail) | 87.9% | — |
| Distal streaks of red-brown coloration (“filamentous” distal end) | 81.8% | — |
| Homogenous red/purple/black coloration without melanin granules | 69.7% | ↓ 60.0% |
| Dermoscopic features of the face (level 2) | ||
| Pseudonetwork | 78.8% | — |
| Benign patterns of acral nevi (level 2) | ||
| Parallel furrow pattern (with pattern variations including single line, double line, single dotted line, double dotted line) | 93.9% | — |
| Lattice-like pattern | 87.9% | — |
| Fibrillar pattern (soles only) | 84.8% | — |
| Homogenous pattern | 75.8% | — |
| Peas-in-a-pod pattern (parallel furrow + globules on ridges) (acral congenital melanocytic nevi) | 69.7% | ↓ 56.7% |
| Nevus of the nail (level 2) | ||
| Uniform band thickness, color, and spacing with parallel band configuration and unbroken lines | 87.9% | — |
| Homogenous brown background coloration | 84.8% | — |
| Lentigo of the nail (level 2) | ||
| Homogenous gray band or lines ± gray background | 78.8% | — |
| Regular light-brown lines† | — | 60.0% |
| Talon noir (level 2) | ||
| Homogenous red-brown coloration | 78.8% | — |
| Cracks (lightning bolt sign)‡ | 51.5% | — |
↵* % of panelists who indicated on a 5-point Likert scale that they “strongly agree” (5) or “agree” (4) with the feature being included in dermoscopy training for primary care providers.
↵† Suggested by a panelist during round 1 of the dermoscopic features survey series.
‡ Feature did not undergo a revote in round 2 due to original threshold criteria for a revote being <70% but >60% positive responses.