I’ve heard that the thickness of the skin is a greater factor in ethnic rhinoplasties. Why is this?

Rhinoplasty success is based on creating a new supporting framework which the skin must shrink and conform to. The presence of thick skin tends to sometimes prevent the ability of the framework shape to come through. this is true in all patients, ethnic or not. Because of that it is sometimes necessary to add cartilage to strengthen the framework and enhance the result.