'Blackened' in the Bible

“I go about mourning without comfort [my skin blackened by disease, not by the heat of the sun];I stand up in the assembly and cry out for help.

“My skin falls from me in blackened flakes,And my bones are burned with fever.

For I have become like a wineskin [blackened and shriveled] in the smoke [in which it hangs],Yet I do not forget Your statutes.