Leviticus 13:47-49

And any clothing of wool or of linen in which is the mark of the disease; If it is in the threads of the linen or of the wool, or in leather, or in anything made of skin; If there are red or green marks on the clothing, or on the leather, or in the threads of the cloth, or in anything made of skin, it is the leper's disease: let the priest see it.