To be honest, that looks a bit odd. Like actual bruises. What is in your tank, besides your midevil?
It's not bruises because its been there since he was about 2" long which is what really makes me scratch my head. His tankmates are a 9" Oscar a 6" Dempsey, a 6" female Carpintis and an 8.5" green terror...in a 240. He bullies the Carpintis and the dempsey a little bit, but he never gets bullied or picked on. These marks started to appear on him when he was alone in a grow out tank.
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