Reference for Zevachim 98:19

אמר ר' יוחנן בכל התורה כולה למידין למד מלמד חוץ מן הקדשים שאין דנין למד מלמד

so in the former too, if it spread over the whole [garment], it is clean. And how do we know it there?<span class="x" onmousemove="('comment',' That a karahath or gabbahath which spreads and covers the whole head is clean? For Lev. XIII, 12-13 refers to leprosy of the skin, not of the head; moreover, they differ in their symptoms. For the symptom of leprosy of the skin is that the hair turns white (ibid. v, 3, 12) , whereas that of a karahath or gabbahath is that the hair turns yellow or reddish-white (ibid. 30, 42) .');">³⁰</span>

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