swell

腫れる(はれる)	Swelling, like you got stung by a bee. PPP

膨らむ(ふくらむ swelling – not only of body parts, but of ANYTHING)	Sails swell in the wind, the universe expands. Often used to describe debt: 借金が膨らむ。

炎症(えんしょう)	Inflammation. Basically the same as 腫れる,but 炎症 is a doctor’s official word.