I had a hematoma that had left a scab and it fell off now I have a hole (crater) that still is not healed.
Hideous mark. A slight discolouration. A blemish. A permanent mark. Unfortunate.
A closed wound is characterised firstly by a crust (scab) formed when blood congeals. This is the body's defense against further infection entering the wound. When the wound is completely healed, and the scab falls away, a scar is left on the damaged skin.
This could be a birth defect or, he could have had an infected wound that healed on it's own. It's best to see your vet to have it checked out.
A scar is a mark left on the skin after a wound or injury has healed. It is composed of fibrous tissue that replaces normal skin tissue. Scars can vary in size, shape, and color depending on the type and severity of the original injury.
A cicatrix is a scar left by the formation of new connective tissue over a healing sore or wound.
Custer was shot in the left breast, just below the left nipple, and also in the left temple. The breast wound bled ... the head wound did not. Thus, the breast wound was likely the fatal wound, and the head wound was likely done post-mortem.
scar
It is a scar.
A scar!
If left alone - when the skin has healed underneath it.
If a wound is left untreated, it can turn to gangrene.