A bulla is a raised lesion that is greater than 0.5 cm in diameter and contains clear fluid. Bullae can get very large and are often subclassified as tense or flaccid depending on how full they are.
Primary Lesions - Bulla
From Heather Brannon, MD, former About.com Guide
Updated August 27, 2006
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Bulla on back
CDCSuggested Reading
Typical Bullous Rashes
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