<unk>  is a condition of the mucous membranes characterized by the sudden appearance of one or more blood blisters within the oral cavity. The lesions, which may be caused by mild trauma to the mouth tissues such as hot foods, typically rupture quickly and heal without scarring or further discomfort. The condition is not serious except in rare cases where a large bulla that does not rupture spontaneously may cause airway obstruction. The blisters usually affect the palate or oropharynx, and are often long lived to the extent that patients burst them for symptomatic relief.
Angina bullosa haemorrhagica
Trichostasis spinulosa
Vaginitis emphysematosa
Pruritus vulvae
Callous ulcer
Genital ulcer
Anal fissure
Stercoral ulcer