CHILBLAIN, a tumour or sore produced by exposure of the extremities to cold; accompanied with inflammation and itching, and sometimes with pain, and even with ulceration. Chilblains are not unfrequently induced by warming the hands and feet too suddenly after exposure to great cold; and hence proximity to the fire should be avoided until the circulation be properly restored. They are generally relieved by moderately stimulating applications; as for instance equal parts of solution of acetate of ammonia, or of vinegar and spirits of wine, or of oil of turpentine and soap liniment. An aqueous solution of alum also is frequently very efficacious, especially if applied after steeping the part affected in hot water.