TT #77 · 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 Sanhedrin 34b for the conclusion that one priest suffices to examine a skin affliction.
English: The verse says, “He shall be brought to Aaron the priest or to one of his sons”; thus even one priest may examine the afflictions.
Textual inference
The singular “one of his sons” means a single qualified priest suffices; the examination does not require a three-priest panel.