Dictionary of Biblical Words:
is a loathsome disease, specially used in Scripture as a type of sin. Thus it was only when it was fully brought out (as sin when confessed), that the leper could be pronounced clean (Lev. 13:13). Like sin, it was contracted from birth, and developed with age. None but God could cure it.
Strong’s Dictionary of Greek Words:
Meaning:
from the same as 3013; scaliness, i.e. "leprosy"