Sometimes they will have almost a "snakeskin" appearance with blue and sometimes yellow around their "face" and gill plate area - I think what you describe is normal coloration, and is good, because these colors indicate good health. Brichardi from different areas of the lake will have specific amounts of blue/yellow, or lack thereof depending on which part they are found.
Your male, as he matures, will also likely get a hump on his head, which he may or may not have already. The hump and the blue coloration often don't show up until the fish are fully mature, even though they may have already spawned as sub-adults.
No cause for alarm.