Dermatology · UKMLA & AKT
Lichen planus
A free high-yield preview for the UKMLA Applied Knowledge Test, covering how to recognise this condition. The full SA Note notes add investigations, management and complications, with practice questions on this topic.
Key high-yield points
- The 6 P's are the core exam target for lichen planus.
- Pruritic - intense itch driven by inflammatory cytokines
- Polygonal - irregular, many-sided shape
- Planar (flat-topped) - band-like infiltrate pressing against epidermis
- Purple/violaceous - dense lymphocytic infiltrate and vascular dilatation
- Papules (or plaques) - solid raised lesions
- Pattern - Wickham's striae: white lacy lines on the surface caused by focal hypergranulosis
- Distribution - flexor aspects of wrists and ankles, lower back, palms, soles, genitalia
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