TT #223 · Parshas Tazria · Aliyah 7 · Passuk 40
English: If a man’s head becomes bald, he is bald; he is pure.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:40
Torah Temimah cites Sifra (Toras Kohanim) for the independent clean status of the bald head even if the beard is affected.
Sifra — Vayikra 13, Midrash Sefer
English: “His head” teaches that the head can be pure under this rule even when the beard is affected; the beard does not prevent the head’s ruling.
The head itself establishes the clean status even when the beard is present.
The head can be declared clean even if the beard remains affected; the beard does not prevent the head’s status.