Vesicle & Bulla
(VES ih kul) (BULL ah, singular; BULL ee, plural)

Vesicles and Bullae are blisters filled with clear fluid. A vesicle can be as large as a pea; when a vesicle is bigger than a pea it is called a bulla. Vesicles and bullae may form within the epidermis or between the epidermis and dermis, and they may contain more than one chamber. These lesions can be provoked by physical or chemical damage (sunburn, chemical burns), infections (herpes simplex, athletes's foot), or immunological responses (allergic contact dermatitis).