Blister refers to a swollen or raised patch filled with fluid that appears on the skin as a result of friction, injury, or heat. It is a common condition that can be quite uncomfortable and painful at times. Fortunately, there are various synonyms for blister that can be used interchangeably depending on the context of usage. Some of the synonyms for blister include vesicle, pustule, bulla, boil, sore, swelling, bump, and welt. These terms can be used in medical settings, discussions on skincare, and in general conversations to describe different types of blisters.