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Vesicle (aka Blister)
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Definition
Bullae are circumscribed, elevated collections (pockets) of fluid within the skin that are > 1 cm in diameter.
Vesicles are < 1 cm.
Notes
Blister is the broadly encompassing term for both bullae and vesicles. Blisters contain fluid of any type: clear, serous, hemorrhagic, or purulent.
Images from:
Large blister (bulla), direct patient image
Small bilster (vesicle)
herpes zoster, shingles