Solar Dermatitis

• Particularly in white animals and where little or no hair is present
• Grossly:
  • Erythema, scaling and crusting
  • -> Wrinkled nand thickened skin
  • Squamous cell carcinoma or haemangiosarcoma/haemangioma may develop
• Microscopically:
  • Dyskeratotic cells
  • Intercellular oedema
  • Vacuolated keratinocytes
  • Followed by hyperkeratosis, parakeratosis and acanthosis
  • Endothelial swelling
  • Haemorrhage
  • Hyperplasia
  • Dermal fibrosis
  • Dogs may develop actinic comedones