Green’s Dictionary of Slang

a sore that counterfeits a kick or bite from a horse.

c.1698		B.E. Dict. Canting Crew n.p.: Footman’s Mawnd, an artificial Sore made with unslack’d Lime, Soap and the Rust of old Iron, on the Back of a Begger’s hand, as if hurt by the bite or kick of a Horse.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.