bulla vs bleb

bulla and bleb both are nouns.

Word	Noun	Adjective	Verb	Adverb
bulla	Yes	No	No	No
bleb	Yes	No	No	No

As nouns, bulla and bleb are synonyms defined as:

bulla and bleb: (pathology) an elevation of the skin filled with serous fluid

Other synonyms of bulla include blister.

bulla (noun)	bleb (noun)
the round leaden seal affixed to a papal bull	(pathology) an elevation of the skin filled with serous fluid
(pathology) an elevation of the skin filled with serous fluid