Bleb
A blister or small bubble. As a noun: 'a bleb on the back of his heel' = a blister. As a verb: to bubble up. The kind of thing you get from a new pair of boots or from holding a kettle too long against the skin.
Etymology
Likely imitative - the 'bl' sound suggests the small swelling. Documented in English from at least the seventeenth century in medical and informal contexts. Standard English mostly dropped the word in favour of 'blister' or 'bubble'; Hiberno-English, Scots, and Northern English kept it, with a slightly informal register.
In a sentence
"Mind the kettle - it'll leave you with a bleb on the finger."
Historical notes
Bleb is one of the small everyday Hiberno-English words that English-elsewhere has bigger or more clinical words for. 'Blister' is a doctor-word; 'bleb' is the kitchen word for the same thing. The noun and the verb are interchangeable in casual speech. Modern medical English sometimes uses 'bleb' for a specific kind of small fluid-filled lesion, but the Hiberno-English use is more general.
Sources
- Oxford English Dictionary, entry bleb n. · dictionary