c. 1400, scrophulas (plural) from Late Latin scrofulæ (plural) "swelling of the glands of the neck," literally "little pigs," from Latin scrofa "breeding sow" (see screw (n.)). The connection may be because the glands associated with the disease resemble the body of a sow or some part of it, or because pigs were thought to be prone to it. Compare Greek khoirades (plural) "scrofula," related to khoiros "young pig."
word-forming element making adjectives from nouns, meaning "having, full of, having to do with, doing, inclined to," from Old French -ous, -eux, from Latin -osus (compare -ose (1)). In chemistry, "having a lower valence than forms expressed in -ic."
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Harper, D. (n.d.). Etymology of scrofulous. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/scrofulous