Dermoscopy Basics: Essential Structures and Patterns

Dermoscopy is a non-invasive diagnostic technique that allows visualization of subsurface skin structures not visible to the naked eye. This guide covers the essential structures: Pigment Network: A grid-like pattern of brown lines. Typical networks are regular and symmetric, while atypical networks show irregular thickness and spacing. Dots and Globules: Small round structures within or outside the pigment network. Regular arrangement suggests benign pathology; irregular distribution raises concern. Streaks: Linear structures at the periphery of lesions. Symmetric radial streaks suggest Spitz nevi; asymmetric streaks raise melanoma concern. Blue-White Structures: Indicate regression or deep melanin. Blue-white veil over raised areas is highly specific for melanoma. Vascular Patterns: Dotted, linear, or polymorphous vessels provide important diagnostic clues across pigmented and non-pigmented lesions.