Rashi: It is a clump of earth. This is corrosion. It is normal for a clump to moisten and corrode.

Ibn Ezra: Some say that it is [feeling,] like "Negasheshah cha'Ivrim."

Ibn Ezra: Some say that it is vitality.

Ibn Ezra: I say that it is a kind of earth, like "mi'Yshenei Admas Afar Yakitzu."

Malbim: My body is not covered by skin - the boils already cleaved and melted my skin. Worms and earth 'clothe' (cover) my flesh, in place of my skin. How can I act to acquire perfection? I am like a Mes, that half its flesh was consumed!

Rashi #1: It folds, like "Roga ha'Yam."

Rashi #2: It is an expression of resting, one wave by another, like these folds.

Ibn Ezra citing R. Moshe: This is cleaved, like "Right'ei Eretz" - one part of it.

Ibn Ezra: This is from Namas (melted). The Aleph is in place of Samech. Also "Baz'u Neharim", the Aleph in Baz'u is in place of [what should be a doubled Zayin, Bazezu - Ibn Ezra Yeshayah 18:2].

Ibn Ezra: It was despised, for it changed. This Perush is primary.