John Gill Commentary 2 Kings 5:27

"The leprosy therefore of Naaman shall cleave unto thee, and unto thy seed for ever. And he went out from his presence a leper [as white] as snow." — 2 Kings 5:27 (ASV)

The leprosy therefore of Naaman shall cleave unto thee, and unto your seed for ever

As long as any of his race remained; as through his covetousness he had his money, so for his punishment he should have his disease:

and he went out from his presence ;

as one ashamed and confounded, and discharged from his master's service:

a leper [as white] as snow ;

a leprosy of which colour is the worst, and is incurable.