Leviticus 13:36

the priest will examine you again. If the sore has spread, he need not look for yellowish hairs. You are obviously unclean.

Treasury of Scripture Knowledge

Summary

Then the priest shall look on him: and, behold, if the scall be spread in the skin, the priest shall not seek for yellow hair; he is unclean.

General references

Bible References

General references

Leviticus 13:7
If the sore spreads after the priest has examined you and pronounced you clean, you must return to the priest again.
Leviticus 14:39
The priest will go back and examine it again on the seventh day. If the mildew in the walls of the house has spread,