John Gill Commentary Leviticus 22:4

"What man soever of the seed of Aaron is a leper, or hath an issue; he shall not eat of the holy things, until he be clean. And whoso toucheth anything that is unclean by the dead, or a man whose seed goeth from him;" — Leviticus 22:4 (ASV)

What man soever of the seed of Aaron [is] a leper A young, or an old man, as the Targum of Jonathan, and indeed man or woman; for the wives and daughters of the priests, if in this, and other circumstances following, might not eat of the holy things until cleansed, who otherwise might, see (Leviticus 13:2) (Numbers 18:13) ;

or has a running issue ; a gonorrhoea, whether man or woman, (Leviticus 15:2Leviticus 15:25) ;

he shall not eat of the holy things until he be clean ; he might eat of the tithes, but not of the wave breast, or heave shoulder:

and whoever touches any [that is] unclean [by] the dead ; not only that touched the dead, which made unclean, but that touched any person or thing that was made unclean by it:

or a man whose seed goes from him ; involuntarily when asleep, in a dream, and through a lustful imagination; see (Leviticus 15:16) .