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a vesicle, especially a bulla.
blood blister a vesicle having bloody contents, as may be caused by a pinch or bruise.
fever b's herpes febrilis.
water blister one with clear watery contents.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
A blister having watery contents without blood or pus.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.