My 6 year old daughter has said she doesn't like the colour of her skin. With gentle questions I'm confident that it's purely that, no race issues involved. I was concerned not to put an adult interpretation into her head and reinforced that she is beautiful. We have also had talks about how our looks change when we smile/frown and how people react to us when we are smiling or frowning. Hope that it is as easy to resolve for you.