The hot spots are caused by specular reflectance - the oil is causing her skin to reflect light like a mirror rather than its more typical behavior, diffuse reflectance. If you want to eliminate the hot spots, you need to control the light striking her. A more diffused source will give less specular reflectance. OTOH, you might want to simply be more careful in your framing and composition, b/c those hot spots emphasize her muscular definition as well as being characteristic of oiled skin. If you've got enough gear and patience, you can use flags and skims to achieve highlights where you want them and none on her face.
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