Edit the S1 file for long sleeves. This has come up before, if make the sleeves longer on the S1 it also adds color to the neck of the player, if you look closely you will see the tape that Old Coach put on the players elbow is also showing up high on his neck.
There's no way to prevent the color bleed on the neck as far as I know. I've spent a lot of time working with the S1 BMP to prevent it but haven't had any luck.
It doesn't make any sense that the bleed occurs. The face BMP looks like it includes the neck area. Why the arm BMP is connected to the face/neck BMP is a mystery. David can explain it I'm sure.