Our skin is stirred up (or ‘black') like an oven,
Because of the burning heat of famine.
The starvation conditions in which they were living had had its effect on their bodies. Their skin glowed like the stirred up ashes of a baker's oven, caused by the feverish heat of hunger. (For the meaning ‘stirred up' rather than ‘black' see Genesis 43:30; 1 Kings 3:26; Hosea 11:8)