TT #66 · 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 Shevuos 6b for this stage in the definition of the skin-affliction appearances.
E-Daf — Shevuos 6b · Shas.org · Sefaria — source text and translation
English: A baraita teaches: Scripture placed sapachas between se'eis and baheres to teach that, just as a secondary shade accompanies se'eis, so a secondary shade accompanies baheres.
Textual analogy
The placement of sapachas between se'eis and baheres teaches that both principal appearances have a corresponding secondary shade.