pīnn-tsàu病灶

locus

locus (of a disease); focus (of an infection); (centre of the) lesion

medicine

English Wiktionary, “病灶” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%97%85%E7%81%B6 · confidence: Medium (Wiktionary, Hokkien)