noun
scar tissue
Medical term referring to fibrous tissue that replaces normal skin after injury.
手術のあと、瘢痕組織が形成されることがあります。
After surgery, scar tissue may form.
傷跡 is a more common, everyday word for a visible scar, while 瘢痕組織 is a technical term for the tissue itself.
Compound of 瘢痕 (はんこん, 'scar') and 組織 (そしき, 'tissue'). The exact historical derivation is uncertain; the spelling is conventionally associated with medical terminology.