Blain
Blain (blān) , noun
[Old English blein, bleyn, Anglo-Saxon blēgen; akin to Danish blegn, Dutch blein; perh. from the same root as English bladder. See Bladder.]
1.
An inflammatory swelling or sore; a bulla, pustule, or blister.
Blotches and blains must all his flesh emboss.
2.
(Farriery) A bladder growing on the root of the tongue of a horse, against the windpipe, and stopping the breath.