Refers to a blister or corn on the skin, typically from friction or pressure. Colloquial term.
I got a blister on my heel from walking in new shoes.
I played guitar too much and got a blister on my finger.
Katakana spelling is sometimes used for emphasis or in casual contexts.
Rare kanji spelling; the characters literally mean 'flesh thorn'.
Obscure single-character kanji form; not in common use.
The origin is uncertain. Possibly related to the word for 'bean' (豆) due to the small, round shape of a blister.