1. A bubble.
2. Medicine/Medical. A blister or vesicle.
Origin
Bleb is considered imitative of a blister itself. It is also related to the Middle English word ‘blob’.
Quotes
One day, as he was bathing her, a bleb of shampoo had streamed into her eye, and she had kept a hand pressed to it for the rest of the day, quailing away from him whenever he walked past.
— Kevin Brockmeier, Things That Fall From the Sky