TT #238 · Parshas Tazria · Aliyah 7 · Passuk 45
English: As for the person afflicted with tzaraas, his garments shall be torn, his head shall be unkempt, he shall cover his upper lip, and he shall call out, “Impure! Impure!”
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:45
Torah Temimah cites Moed Katan 14b for including a Kohen Gadol in the metzora rules.
E-Daf — Moed Katan 14b · Shas.org · Sefaria — Moed Katan 14b, source text and translation
English: The term “metzora” includes even a Kohen Gadol (High Priest) in the laws stated here; the office of High Priest does not exempt him from them.
Textual derivation
The metzora laws described here include the High Priest.