瘍 (readings: よう, かさ; Japanese kanji) means “Swelling / Boil / Tumor”. It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 腫瘍 (tumor).
What does 瘍 mean?