Green’s Dictionary of Slang

acned, heavily pimpled; seen as the badge of a drunkard.

c.1698		B.E. Dict. Canting Crew n.p.: Corny-fac’d, a very Red or Blue pimpled Phiz.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1933		‘William Juniper’ True Drunkard’s Delight 247: Corny-faced – Red and pimply with drink. (not dated).