The Collaborative International Dictionary of English v.0.48:

Chilblain \Chil"blain`\, chilblains \chil"blains\, n. [Chill +
   Blain.]
   A blain, sore, or inflammatory swelling of the feet or hands,
   produced by exposure to cold, and attended by itching, pain,
   and sometimes ulceration.

   Syn: pernio.
        [1913 Webster + WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Chilblain \Chil"blain`\, v. t.
   To produce chilblains upon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chilblain
    n 1: inflammation of the hands and feet caused by exposure to
         cold and moisture [syn: chilblain, chilblains,
         pernio]

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "chilblain":
   Minamata disease, abscess, ache, aching, altitude sickness,
   anoxemia, anoxia, anoxic anoxia, anthrax, aposteme, bed sore,
   black lung, blain, bleb, blister, boil, bubo, bulla, bunion,
   caisson disease, canker, canker sore, carbuncle, chancre,
   chancroid, chilblains, chill, chilliness, chilling, cold creeps,
   cold shivers, cold sore, creeps, cryopathy, decompression sickness,
   dithers, duck bumps, eschar, felon, fester, festering,
   fever blister, fistula, frostbite, furuncle, furunculus, gathering,
   goose bumps, goose pimples, gooseflesh, gumboil, hemorrhoids,
   horripilation, immersion foot, itai, jet lag, kibe, lead poisoning,
   lesion, mercury poisoning, motion sickness, papula, papule,
   paronychia, parulis, petechia, piles, pimple, pneumoconiosis, pock,
   polyp, pustule, radiation sickness, radionecrosis, red-out, rising,
   scab, shivering, shivers, soft chancre, sore, stigma, sty,
   sunstroke, suppuration, swelling, the bends, trench foot, tubercle,
   ulcer, ulceration, wale, welt, wheal, whelk, whitlow, wound