swell ‧ ing /ˈswelɪŋ/ BrE AmE noun
1 . [countable] an area of your body that has become larger than normal, because of illness or injury
swelling in/on
a painless swelling in his neck
2 . [uncountable] the condition of having swelled:
The spider’s bite can cause pain and swelling.
These tablets should reduce the swelling.