TT #172 · Parshas Tazria · Aliyah 4 · Passuk 24
English: If the flesh has a burn from fire in its skin, and the raw area of the burn becomes a bright reddish-white spot or white,
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:24
Torah Temimah cites Pesachim 75a for the range of burns included by the term “burn of fire.”
E-Daf — Pesachim 75a · Shas.org · Sefaria — Pesachim 75a, source text and translation
English: The term 'burn' includes burns from a coal, hot ash, hot lime, hot plaster, and other heat produced by fire, including heated water.
Textual derivation
The term 'burn' covers thermal injuries from several forms of heat, not only direct flame.