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to swell up
捻挫で足首が腫れ上がった。
My ankle swelled up from the sprain.
蜂に刺され頬が腫れ上がって痛む。
My cheek is swollen and painful after a bee sting.
虫に刺され腫れ上がるようなら受診しよう。
If you get an insect bite and it swells up, you should see a doctor.