Photoenhanced Dermatoses

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  • Many immune-mediated cutaneous disease are made worse by sunlight
    • Lupus erythematosus
    • Dermatomyositis
    • Pemphigus erythematosus
  • Vasculitis in extremities, especially white-haired horses
  • Grossly:
    • Erythematous, well circumscribed crusted lesions or hyperkeratotic plaques
  • Microscopically:
    • Vasculitis of superficial dermal vessels
    • Thrombi may be seen