Green’s Dictionary of Slang

having one’s face pitted with the scars of smallpox.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: stub-faced Pitted with the Small pox: the Devil run [sic] over his face with horse Stubbs (horse nails) on his Shoes.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.