- 🔬Pathophysiology
- Immune-mediated (T-cell) keratinocyte hyperproliferation → thick scaly plaques.
- 🩺Signs & Symptoms
- Well-demarcated erythematous plaques with silvery scale on extensor surfaces/scalp; nail pitting.
- 🎯Gold Standard Diagnosis
- Clinical; biopsy if unclear (Munro microabscesses).
- 💊First-line Treatment
- Topical corticosteroids + vitamin D analogs; phototherapy; biologics for severe disease.
High-Yield PearlExtensor plaques with silvery scale + nail pitting = psoriasis; Auspitz sign = pinpoint bleeding on scale removal.