Leviticus 13:24-28

²⁴When someone has a burn on his skin and a bright/shiny or white spot appears, and the flesh in that area is sensitive/painful,

²⁵the priest must examine the spot. If the hair in that spot has turned white and it seems to be deeper than just on the surface of the skin, it is a contagious skin disease that has appeared where the burn was, and that person must stay away from other people.

²⁶But when the priest examines it and sees that there is no white hair in that spot and it is only on the surface of the skin, and has faded, the priest will declare that the person must stay away from people for seven days.

²⁷On the seventh day, the priest will examine him again. If the sore is spreading, it is a contagious skin disease, and the priest will declare that the person must stay away from other people.

²⁸However, if the spot is not changed and has not spread but has faded, it is only a scar from the burn, and the priest will declare that the person is permitted to be with other people again.