Leon is the hair made using PaintFX or handpainted? It looks to me as if the transparency/blending picks up too much of the skin color and you get the gel effect (not trying to be funneh).
If it's handpainted it's easy to fix with a bristle brush and make sure there's no half opacity down there. If it's paint FX I have to guess more as I've never used it, but I'd try a harder more opaque brush if you can choose. A different brush in other words. See if you get the same results.