http://www.acandyrose.com/jonbenetneck.jpg
Those tiny marks above the ligature....those look like scratches to me.
They are petechial hemorrhages. The coroner made no note of scratches on her neck. This is an important point, as scratches could mean she struggled. There were none.
The gold metal chain that can be seen wrapped in the garrote could have scratched, but again, no mention was made of this.