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[Clinical Picture] Erythema multiforme major with swollen lips and crusted erosions

A 41-year-old woman presented to our clinic because of the sudden appearance of erosions on and swelling of her lips. On clinical examination, diffuse erythema of the labial mucosae with small vesicles and crusted erosions on both the superior and inferior vermillion borders were noted (figure). Further inspection of her mouth showed erythema and erosions on the inner cheek and mild focal desquamated gingivitis. The patient was otherwise healthy, with good oral hygiene. No other lesions were seen on the rest of her body.