Where does “eksem” come from?

eksem (Norwegian Nynorsk) comes from Ancient Greek ἔκζεμα, from Ancient Greek ζέμα, from Ancient Greek ζέω, from Proto-Indo-European yes- — to foam; to boil.

eksem (Norwegian Nynorsk): <br>; eczema

Definitions

<br>; eczema

Ancestry of “eksem”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἔκζεμα	cutaneous eruption, an eczema
2	Ancient Greek	ζέμα	fermentation, boiling
3	Ancient Greek	ζέω	to boil, seethe, bubble; to heat
4	Proto-Indo-European	yes-	to foam; to boil

Every word from Proto-Indo-European yes- →Every word from Ancient Greek ζέω →Every word from Ancient Greek ζέμα →