yeast and eczema

yeast is from Old English ġist from Proto-Germanic *jest- from Proto-Indo-European *yes- "to boil, bubble".

*yes- became Greek ζέω (zeō) "ferment, boil, bubble". Combined with ἐκ "out" gave ἐκζέω (ekzeō) "boil out or over, break out (in disease)" and ἔκζεμα (ekzema) "a cutaneous eruption, eczema".