TT #225 · Parshas Tazria · Aliyah 7 · Passuk 41
English: If the front of his head becomes bald, he is bald at the front; he is pure.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:41
Torah Temimah cites Sifra (Toras Kohanim) for including the temples in the frontal baldness category.
Sifra — Vayikra 13, Midrash Sefer
English: The phrase “the side toward his face” includes the temples on both sides, as derived from the repeated wording.
The frontal baldness area includes the side-temples.
The frontal baldness category includes both temples, not only the area directly at the front.