Impetigo

• = Superficial pustular dermatitis
• Caused by coagulase-positive Staphylococcus spp.
• Associated with:
  • Abrasions
  • Poor nutrition
  • Viral infections
  • Immunosuppression (often due to hyperadrenocorticism)
• Grossly:
  • Pustules -> crusts, mostly in hairless skin
• Microscopically:
  • Interfollicular neutrophilic subcorneal pustule