Dermatology · UKMLA & AKT
Lichen planus
A free high-yield preview for the UKMLA Applied Knowledge Test. Below are the key points to recognise lichen planus — the full SA Note notes add investigations, management, complications and 10 practice questions.
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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