New dark spot on A Baenschi face. What is it?

[Kazarak]

See the dark spot right above his mouth? That’s new. Any idea if it’s something to worry about or is it new color coming in?

 

[MacZ]

Dark colour. Many fish don't have a clean, "spotless" colouration. My A. ortegai has a few dark spots that are not body symmetrical, too. Saw that a lot in african cichlids, barbs and catfish as well.