Irregularly shaped elevation of the epidermis. A blister.
Blisterlike collection of fluid under the skin, varying from bean- to egg-sized.
An irregularly shaped elevation of the epidermis; a blister or a bulla. Blebs may vary in size from less than 1 cm to as much as 5 to 10 cm; they may contain serous, seropurulent, or bloody fluid. Blebs are a primary skin lesion that may occur in many disorders, including dermatitis herpetiformis, pemphigus, and syphilis.