Effects of intraperitoneal injection of geranium oil on the inflammation by intradermal curdlan injection. Geranium oil was injected immediately and 3 hr after curdlan injection. Predonisolone, as positive control, was injected 1 h before curdlan injection. After 6 hr, skin was cut off for the MPO assay and histological examination. (a) The MPO activity from skin lesion. (b) Histological examination. Each value represents an average of 5–6 mice and the standard deviation. ** p < 0.01 compared with control.