Histopathologic spectrum of oral erythema multiforme.

The histopathologic tissue patterns found in twenty-five patients with oral erythema multiforme were as variable as the clinical appearances. The biopsies served an important role in ruling out malignancy, dysplasia, and other classified diseases. While all of the specimens were designated as showing nonspecific inflammatory reactions, in many biopsy specimens there were sufficient characteristic connective tissue and epithelial changes to suggest a tissue diagnosis consistent with the clinical diagnosis of erythema multiforme.