Senses
疙疸 swelling
A swelling or lump on the skin such as a pimple or bump; now generally written as 疙瘩
疙疸 problem
(metaphorical) A knot in one's heart, a preoccupation, or a difficult problem; now generally written as 疙瘩
疙疸 patch
(archaic) A knot in clothing or a patch for a hole in a garment.