Diagnosis of Oral Lesions
Blisters and vesicles are very transient in the oral cavity, and rapidly result in painful superficial erosions. Identification of the cause may be helped by the presence of cutaneous blisters and vesicles and of other mucosal lesions. The main cause of acute bullous diseases is erythema multiforme (Fig. 37.1), sometimes isolated with no cutaneous lesion. Mucous erosions from Stevens–Johnson syndrome, toxic epidermal necrolysis and fixed eruption are very similar.