Mark 1:40-45 “And there came a leper to him, beseeching him, and kneeling down to him, and saying unto him, If thou wilt, thou canst make me clean. And Jesus, moved with compassion, put forth his hand, and touched him, and saith unto him, I will; be thou clean. And as soon as he had spoken, immediately the leprosy departed from him, and he was cleansed. And he straitly charged him, and forthwith sent him away; And saith unto him, See thou say nothing to any man: but go thy way, shew thyself to the priest, and offer for thy cleansing those things which Moses commanded, for a testimony unto them. But he went out, and bega into the city, but was without in desert places: and they came to him from every quarter.” n to publish it much, and to blaze abroad the matter, insomuch that Jesus could no more openly enter
Jesus often told people to not tell others about His healing works. This seems to have been to prevent large crowds which made it more difficult to move about. It was also because Jesus’ main purpose was not to physically heal people but to die on the cross for our sins.