It is unlikely that it is a wart given your history of trauma. It can be due to abscess
or cellulites skin. Cellulitis is an acute infection of skin and soft tissues characterized by localized pain, swelling, tenderness, erythema, and warmth.It usually follows a break in the skin, such as a fissure, cut, laceration, insect bite, or puncture wound.
I suggest you to get an evaluation done from a dermatologist.
I hope it helps. Take care and regards.