I was reading this post and I 'think' I've seen something similiar. I was actually at one of the lfs' in the area and was thinking about getting a couple of kissing gouramis. I was looking at the two biggest ones in the tank and noticed that they both had a bright dark green (if that makes sense!) spot. One fish had this spot on it's nose and the other had the same spot on it's backside. The employee wasn't sure what the spots were either. Needless to say, I went back to the store about a week later. I checked out the two fish I was eyeing and the spots were just about 100% gone. I actually bought one of these fish and after about another week or so the spot that was on his(?) nose is now gone. So hopefully, it disapears.
Did the green spots just appear on your fish?
Or is it clearing up already?