[stlnative]

I will post this over here...

Blood blisters are a type of blister that is filled with blood rather than the fluid commonly associated with blisters. Blood blisters are caused by a rupture of the blood vessels underneath the skin’s surface. This rupture is usually caused by some form of trauma, such as pinching.

Like all forms of blisters, blood blisters form on the upper layer of the skin. They are the body’s natural response to pressure or injury. What differentiates blood blisters from other blisters is the fact that the trauma caused the blood vessels to rupture.

(in my opinion "hickey's" are considered a mild form of blood blisters, they draw the blood up to the surface of the skin. Dry Friction and pinching of the skin can cause blood blisters in private part areas. Also human bites and pinch bites that do not break the skin will cause blood blisters and sometimes bruising.)

[hoosiermama]

RE blood blisters
"This rupture is usually caused by some form of trauma, such as pinching."

The electric fence charger we have uses small "pinchers" to connect to the wire fence. But the wounds in the picture seem smaller than they are.

OTOH anyone with a pair of plyers and a wire cutter could reconnect smaller clamps. I imagine the result of a automobile battery charger (Mine can regulate the amount of charge) might cause someone to be unconscious. Dealing in automobile the battery charger would be a must for his business.