If a man
'iysh (eesh)
a man as an individual or a male person; often used as an adjunct to a more definite term (and in such cases frequently not expressed in translation)
or woman
'ishshah (ish-shaw')
irregular plural, nashiym {naw-sheem'}; a woman
have a plague
nega` (neh'-gah)
a blow (figuratively, infliction); also (by implication) a spot (concretely, a leprous person or dress) -- plague, sore, stricken, stripe, stroke, wound.
upon the head
ro'sh (roshe)
the head (as most easily shaken), whether literal or figurative (in many applications, of place, time, rank, itc.)
or the beard
zaqan (zaw-kawn')
the beard (as indicating age) -- beard.