Leviticus 13:49

if it is greenish or reddish, it is a spreading mildew and must be shown to the priest.

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Summary

And if the plague be greenish or reddish in the garment, or in the skin, either in the warp, or in the woof, or in any thing of skin; it is a plague of leprosy, and shall be shewed unto the priest:

General references

Bible References

It is

Leviticus 13:2
If any of you have a sore on your skin or a boil or an inflammation that could develop into a dreaded skin disease, you shall be brought to the priest.

General references

Leviticus 14:37
He will examine the mildew area on the walls. If it is green and red in sunken areas that are deeper than the rest of the wall,