Leviticus 13:3-4

13:3 The priest must then examine the infection on the skin of the body, and if the hair in the infection has turned white and the infection appears to be deeper than the skin of the body, then it is a diseased infection, so when the priest examines it he must pronounce the person unclean.

A Bright Spot on the Skin

13:4 “If it is a white bright spot on the skin of his body, but it does not appear to be deeper than the skin, and the hair has not turned white, then the priest is to quarantine the person with the infection for seven days.