In magnetic resonance imaging (MRI), skin markers are used as a landmark in order to make plans for examinations. However, there isn’t a lot of research about the material and shape of skin markers. The skin marker’s essential elements are safety, good cost performance, high signal intensity for T₁ weighted image (T₁WI) and T₂ weighted image (T₂WI), and durable. In order to get a high signal-to-noise ratio (SNR) of T₁WI and T₂WI, baby oil, salad oil and olive oil were chosen, because these materials were easy to obtain and safe for the skin. The SNR of baby oil was the best. Baby oil was injected into the infusion tube, and the tube was solvent welded and cut by a heat sealer. In order to make ring shaped skin markers, both ends of the tube were stuck with adhesive tape. Three different diameters of markers were made (3, 5, 10 cmφ). Ring shaped skin markers were put on to surround the examination area, therefore, the edge of the examination area could be seen at every cross section. Using baby oil in the ring shaped infusion tube is simple, easy, and a highly useful skin marker.