You can edit the layers in the Layered Image Editor - in the Surfaces pane, select the affected skin area, then click on the image micro thumbnail next to a property to get a menu and select Layered Image Editor - you can then highlight and remove the unwanted layers. You may well need to adjust several maps. If you want to completely clear the add-ons re-apply the base material set.
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You can edit the layers in the Layered Image Editor - in the Surfaces pane, select the affected skin area, then click on the image micro thumbnail next to a property to get a menu and select Layered Image Editor - you can then highlight and remove the unwanted layers. You may well need to adjust several maps. If you want to completely clear the add-ons re-apply the base material set.