Could it by any chance be his breath? The breath can make the face smell fishy, because bullies breath out of their noses so much. Also, check for any sign of bacteria in his nose rope wrinkle. Does not have to be red in color to be stinky. Molly's is never red but sometimes it is light yellow or light green. Who knows what kind of infection it is, but it happens sometimes if I slack at keeping it dry. If you do clean the rope wrinkle, it needs to be dried out too. If you leave moisture in there when you wipe you are not helping anything, you are actually making it worse. That little area in the nose rope can stink up the whole face.