Infectious DiseasesTier 1Topic overview

Common skin infections

Framing

  • Common skin infections span bacterial (cellulitis and other streptococcal/staphylococcal disease), fungal, and parasitic (head lice, scabies) causes - each with a distinct mechanism and treatment, but sharing the general principle that accurate morphological recognition (spreading erythema vs scaling vs burrows/excoriation) narrows the differential before any investigation is needed
  • Cellulitis in particular requires distinguishing true bacterial infection from its mimics (venous eczema, lipodermatosclerosis) given the consequences of both under- and over-treating with antibiotics

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