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It looks to me like the skin color is showing on the hair mesh, resulting in a slight mismatch of color and some shadowing depending on lighting. You'd fix it by correcting the alpha of the hair texture or the uv mapping of the hair mesh so that the entire mesh has the hair color applied. That would change the shape of the hairline, though, so you might prefer to reshape the hair mesh so the parts that show skin color are inside the head mesh.
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