John Gill

And there came a leper to him,.... After he was come down from a certain mountain, in Galilee, where he had been preaching to the people, Mat 8:1, and when be was in a certain city, Luk 5:12, either Capernaum, or some other city of Galilee. This man was full of leprosy, as Luke says, and very probably deemed incurable; of the nature and symptoms of the leprosy; see Gill on Luk 5:12, beseeching him; to cure him of his leprosy: and kneeling down to him; in token of submission, respect, and reverence, and to worship him: and saying unto him, if thou wilt thou canst make me clean; See Gill on Mat 8:2. Mark omits the word "Lord".