| Chaos and clues, prediction without pigment | Two-step algorithm |
- Eccentric structureless area of any color, except skin color
| - Atypical (off-centered) blotch
- Peripheral brown structureless areas
- Scar-like depigmentation
- Blue-gray ovoid nest
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- Thick lines, reticular or branched
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- Gray or blue structures (ie, lines, circles, clods and dots)
| - Atypical dots and globules
- Granularity (also known as peppering)
- Blue-white veil
- Large blue-gray ovoid nests
- Multiple blue-gray non-aggregated globules
- Brown or gray dots arranged in a linear distribution within (but usually towards the periphery of) the lesion
- Asymmetric gray perifollicular openings
- Angulated lines
- Rhomboidal structures
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- Black dots or clods, located in the periphery
| - Atypical dots or globules
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- Radial lines or pseudopods, segmental (or focal)
| - Streaks (ie, pseudopods and radial streaming)
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- White lines, including:
- Reticular white lines (seen with both polarized and non-polarized dermoscopy)
- Polarizing-specific white lines, which are arranged perpendicularly to each other (only seen with polarized dermoscopy)
| - Crystalline structures (also known as shiny white lines), seen with PD
- Negative network (also known as inverse or reverse network), seen with PD and NPD
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- Polymorphous vessels (more than one vessel morphology)
| - Polymorphous vessels (more than one vessel morphology within the same lesion)
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- Lines parallel, ridges (volar) or chaotic (nails)
| - Parallel ridge pattern (volar)
- Irregular pattern (nails)
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- White lines, including:
- Reticular white lines
- Polarizing-specific white lines
| - Negative network (also known as inverse or reverse network), seen with PD and NPD
- Crystalline structures (also known as shiny white lines), seen with PD
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- White structureless areas
| - Shiny white blotches
- Scar-like depigmentation
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