Rare medical term. In everyday language, 咬傷 (こうしょう) or かみ傷 (かみきず) are more common.
See also: 咬傷
The medical record noted 'bite wound on the right forearm'.
Compound of 咬 (こう, 'to bite') and 創 (そう, 'wound'). The exact historical derivation is uncertain, but it follows standard Sino-Japanese word formation patterns.