Bulla (aka Blister)
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.
- Large blister (bulla), direct patient image
- Small bilster (vesicle) herpes zoster, shingles