Leviticus 13:29

בראש או בזקן UPON THE HEAD OR UPON THE BEARD — Scripture intends to make a difference between a plague which is on a place where hair grows and a plague which is on a place where flesh is (already mentioned v. 38) — that as regards this (that on the flesh) its symptom of uncleanness consists in white hair, and as regards the other its symptom consists in gold-coloured hair (Sifra, Braita d'Rabbi Yishmael 14).

וְאִישׁ֙ א֣וֹ אִשָּׁ֔ה כִּֽי־יִהְיֶ֥ה ב֖וֹ נָ֑גַע בְּרֹ֖אשׁ א֥וֹ בְזָקָֽן׃

If a man or a woman have a plague upon the head or the beard;