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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


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.
Farlex Partner Medical Dictionary © Farlex 2012


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

bleb′by adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A blister-like collection of fluid, within or under the epidermis of the skin, usually containing serum or blood.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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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