Bullous
: Characterized by blistering, such as in a second-degree burn. Bullous is the adjective for bulla. A bulla is a blister more than 5 mm (about 3/16 inch) in diameter with thin walls that is full of fluid. A bulla on the skin is a blister. A bulla on the pleura (the membrane covering the lung) is 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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Relating to, of the nature of, or marked by, bullae.
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bul·lous 'bu̇l-əs adj resembling or characterized by bullae:
VESICULAR <\bullous lesions>
Medical dictionary.
2011.