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Erythema multiforme and Stevens-Johnson syndrome. A, B. Bilaterally symmetrical hyperkeratotic and ulcerative plaques in a dog with erythema multiforme. C. Bright red erythematous macules progressing to serpiginous erosions and ulcers in a dog with Stevens-Johnson syndrome. D. Ulcers and erosions on the lips and gums in a dog with Stevens-Johnson syndrome.
