Individual variations of the IL-18 expression levels in non-lesional and lesional skin before and significantly lower IL-18 expression was detected in non lesional skin than lesional skin before treatment (P = 0.018). The change of expression levels in lesional skin after treatment was not statistically significant when compared to non lesional skin (P = 0.069) and lesional skin before treatment (P = 0. 12) after receiving topical steroids are presented in Figure 3 .