*Raz B’s brother Ricky Romance claims he was attacked at a concert in Atlanta last night … and that the man responsible for the incident is rapper Yung Joc, reports TMZ.

Ricky claims Raz was scheduled to perform last night at the Salute the DJ’s Award Show — but he never made it to the stage

According to Ricky, Joc’s security team stopped Raz in his tracks and refused to let him perform — all because Raz publicly dissed Yung Joc in a song a few months ago.

Ricky tells TMZ he tried to help get his brother past Joc’s security guards, but they stopped him and roughed him up instead.

Ricky claims he suffered some nasty cuts to his head during the melee — before he and Raz were both forcefully thrown out of the Atrium Event Center.

Click here to watch video, courtesy of insaneradioatl.com.

No police report was filed.