TT #72 · Parshas Tazria · Aliyah 1 · Passuk 2
English: When a person has on the skin of the body a swelling, a rash, or a discoloration, and it develops into a scaly affection on the skin of the body, it shall be reported to Aaron the priest or to one of his sons, the priests.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:2
Torah Temimah cites Sifra (Toras Kohanim) for reading “affliction” as something that causes distress to the person who bears it.
Sifra — Vayikra 13, Midrash Sefer
English: “For a lesion”—this teaches that the person is distressed by the lesion.
Textual inference
The Sifra connects the word “lesion” with the distress it causes the person who bears it.