Bullae: More than one bulla, a bulla being a blister more than 5 mm (about 3/16 inch) in diameter with thin walls that is full of fluid.
Blisters on the skin are called bullae.
In Latin a bulla (plural: bullae) was a "bubble, stud or knob." It referred to any rounded protrusion, particularly one that was hollow or cystic.
Quick GuideRosacea, Acne, Shingles: Common Adult Skin Diseases
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Last Editorial Review: 5/13/2016