O.E. pocc "pustule," from P.Gmc. *puh(h)- "to swell up, blow up" (cf. Du. pok, Low Ger. poche), from PIE base *bhu- "to swell, to blow." The plural form, M.E. pokkes, is the source of pox, which since early 14c. has been used in the sense "disease characterized by pocks." The verb meaning "to disfigure with pits or pocks" is attested from 1841. Pock-mark is recorded from 1670s as a noun, 1756 as a verb.