Letter B

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.

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