The New Zealand Railways Magazine, Volume 12, Issue 3 (June 1, 1937)
Chilblains are really a slight frostbite. They develop when there is poor circulation in the part affected. The best preventive therefore is to eat nourishing food and have sufficient exercise—warmth being an important factor.page 59
Persons who are predisposed to chilblains should aid circulation by massage of the hands and feet. The use of methylated spirits, with the massage, is helpful as it hardens the skin. Any affected parts may be painted with weak tincture of iodine, but this should not be applied to broken chilblains.