מילון על שבת 193:15

ויחר אף ה' בם, “and the anger of Hashem was kindled against them;” according to some commentators Aaron was also smitten with tzoraat;” (to account for the word: בם, “against them”) Another sage holds that G-d contented Himself with being angry at Aaron without taking any action against him. (Compare Talmud in tractate Shabbat folio 97)