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 [bul´ah] (pl. bul´lae) (L.)
1. a circumscribed, fluid-containing, elevated lesion of the skin, usually more than 5 mm in diameter. Called also blister and bleb.
2. an anatomical structure with a blisterlike appearance. adj., adj bul´late, bul´lous.


1. A large flaccid vesicle.
2. An air-filled lung cyst within or contiguous to the visceral pleura, usually seen radiologically at the lung apex; more likely to develop and to rupture with resulting pneumothorax in taller people. Compare: bulla.


1. A small blister or pustule.
2. An air bubble.

bleb′by adj.


Cell biology
A hemispherical protrusion from a cell’s surface, which may be filled with fluid or supported by a network of microfilaments.

A saccular subpleural expansion of lung tissue measuring up to 1 cm in greatest dimension (bullae are larger), often located at the apex, which is more common in tall male smokers and may be accompanied by spontaneous pneumothorax.


1. A large, flaccid vesicle.
2. An acquired lung cyst, usually smaller than 1 cm in diameter, similar to but smaller than a bulla, which is thought to be the most common cause of spontaneous pneumothorax. Blebs occurmainly in the apex of the lung.


A blister-like collection of fluid, within or under the epidermis of the skin, usually containing serum or blood.

Patient discussion about bleb

Q. What's the best treatment for a blister?

A. use a clean needle and poke a small hole right at the base, between normal skin and the blister. Push the blister down, allow it to drain completely and put a bandaid over it; don't ever rip off blister skin allow it to fall off or reattach naturally.

Q. What are the causes of viral blisters on the skin? For a few months now I've been having these hard viral blisters on my fingers. The only way to get rid of them is with freezed carbon. It does go away with that treatment- after a few weeks but then a new one appears. How can I prevent it from "attacking" again??

A. These viral blisters you are describing are caused by HPV (papilloma virus), and are very hard to get rid of without treatment with freezed carbon. Many of us have the virus but not everyone gets the actual infection. There is not a proved way of preventing from it to happen again after treatment, unfortunately..

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References in periodicals archive ?
The presence and increase of silicification and albite alteration, in association with the increase in blebby sulphides, is extremely encouraging as this style of alteration is very important throughout the Goldfields region as it normally indicates a more highly prospective part of a mineralised gold system.
The massive sulphides are within a larger zone with a combined downhole thickness of ~10m containing mostly disseminated, blebby, massive, breccia and stringer sulphides.
Strengite forms a vitreous coating on green frondelite, and also white blebby crystals in vugs in the frondelite.