Leviticus 13:6 - Matthew Poole's English Annotations on the Holy Bible

If the plague be somewhat dark; which is opposed to the white colour of the leprosy. But the word may be rendered, have contracted itself, or, be restrained or confined to its former place and bigness; and thus the opposition seems to be most clear to the spreading of itself, mentioned both in the foregoing verse, and in the following clause. He shall wash his clothes, though it was no leprosy, but a scab only; to teach us, that no sin was so small which did not need to be washed by the blood of Christ, which was the thing designed by all these washings.