LEV137 Do not shave off the hairs immediately adjacent to a sign of tzara’as.... for only if the adjacent hair is left alone will the Kohen be able to determine whether the balding is spreading. Through this mitzvah, the afflicted person receives a hint that he must accept the woe and punishment that Hashem has sent upon him. He must not try to conceal or nullify what has happened. He must not rebel against his punishment. Rather he must accept it and beg for mercy so that Hashem will cure him.