Trombiculidiasis

• Harvest mite infestation (chiggers) - Trombicula sp.
• Form tunnels in epidermis by injecting saliva - eat digested tissue fluid
• Intense pruritus
• Grossly:
  • Small, red papules or crusts
  • Orange to red larvae
  • On skin close to plants or the ground
• Microscopically:
  • Hyperplastic, superficial perivascular dermatitis
  • Eosinophils, mast cells
  • Intraepidermal mites