潰瘍

1. Origins, structure, and basic meaning

• Structure: Written 潰瘍 and read かいよう, it is a lesion in which skin or mucous tissue is deeply damaged and eroded.
• Basic usage: It appears as a medical-index entry and as a site marked on an anatomical model.

2. Common pitfalls and similar expressions

• Medical lesion rather than minor cut
  • The term denotes tissue loss and ulceration, not a superficial temporary scratch.