For me, a wound involves a break in the skin and bleeding.

According to my first aid manual, wounds can be open or closed.

Open wounds include:- puncture wounds; incisions; thermal, chemical and electrical burns; bites and stings; gunshot wounds; abrasions; lacerations; skin tears.

Closed wounds include:- contusions (eg bruising); blisters; seroma; haematoma (blood blisters); crush injuries.

DC