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Definition of Bulla

Bulla: A fluid-filled blister more than 5 mm (about 3/16 inch) in diameter with thin walls.

A bulla on the skin is a blister. A bulla on the pleura (the membrane covering the lung) is also called a bleb.

In Latin a bulla was a "bubble, stud or knob." It referred to any rounded protrusion, particularly one that was hollow or cystic.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=2547
Last Editorial Review: 8/28/2013

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