腫 means “swell, swelling”

はれる · hareru

Also: tumor

Kun'yomi (Japanese reading)
はれる, はれ, はらす, はれもの
On'yomi (Chinese reading)
シュ, ショウ

JLPT N1 · Taught in secondary school · 13 strokes

The story

Flesh (月) grown heavy (重): a swelling. 腫れる is to swell, a twisted ankle or eyes after crying, and a 腫れ物 is a boil, so treating someone 腫れ物に触るよう is handling them like a sore spot.

Used in 腫れる (hareru, to swell), 腫瘍 (shuyou, tumor), and 腫れ物 (haremono, boil/swelling)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.