The retinoids in rosehip oil can help brighten your skin, prevent blackheads, and reduce inflammation. Rosehip oil also contains linoleic acid, a fatty acid that can aid acne prevention and shrink pimples. Rosehip oil may help treat eczema, an inflammation of the skin that can cause itching and redness.Peppercorn can improve blood circulation, which helps deliver oxygen and nutrients to the skin.