when exporting a CC3 character to unity, the nostril lighting is acting all wrong. Even when the lighting is straight above the character pointing down, the nostrils are lit. This also seem to be a problem with the mouth, lower waterline, and ears. When the light is pointing upwards, it has the opposite effect, with the nostrils being completely black. This is also an issue with your Unity-tutorials.
After we checked the issue that you mentioned, we confirmed that our character's nostril won't lit under the light.
Please check the attached images. (One is our character, one is Daz Studio's character.)
By the way, we doubt that if our skin texture too bright cause you thought the nostril is glowing?
Please let us know if this suspicion is the right solution for you?