Last modified: 4 days
Blister (from French "blestre" meaning "swelling" is the visible accumulation of clear fluid in the upper layers of skin.
Patient informationWhat is a blister?
It's those things that you get on your leg, if you've put too much pressure on it. It appears as a spherical bump, with fluid inside.
- Vesicle, is a spherical solid elevation, containing fluid. It's diameter is <5mm. The fluid contained is either serous fluid (protein and water) or pus (yellow inflammatory exudate)
- Bulla, is a vesicle that is >5-10mm
Patient informationWhat types of spherical bumps with fluid inside, are there?
So there's a vesicle or bulla. So it's classified based on the diameter. Vesicle is <5mm. Bulla is >5mm.
- Chemical exposure
Patient informationWhat causes spherical bumps with fluid inside?
So some sort of irritation, whether it be friction, burning, freezing, chemical exposure, or infection.