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Blisters containing clear fluid, less than 1cm in diameter is:

 # Blisters containing clear fluid, less than 1cm in diameter is: 
A. Vesicle 
B. Bulla 
C. Pustule 
D. Nodule 


The correct answer is A. Vesicle.

Vesicles: These are small blisters containing clear fluid that are less than 1 cm in diameter.
Bullae: These are elevated blisters containing clear fluid that are greater than 1 cm in diameter.
Pustules: These are blisters containing purulent material and appear yellow.
Nodules: These lesions are present within the deep mucosa. The lesions may also protrude above the mucosa forming a characteristic dome‐shaped structure. A good example of an oral mucosal nodule is the irritation fibroma.

Ref:  Burket's Oral Medicine, 13th Edition.

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