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Vesicle
A small circumscribed elevation of the epidermis containing
clear fluid less than 1 cm.
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Vesicle with haemorhagic contents on the skin of a dog with
a drug reaction |
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Bulla
As above but more than
1 cm diameter.
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Large flaccid bulla on the abdomen of a dog with erythema
multiforme caused by a drug reaction |
Note the difference from a pustule.
Vesicular diseases are generally rare in all species, at least in
the U.K. Viral infections, auto-immune diseases and irritant chemicals
are important causes.
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