TLR2 and dermatitis: The effect of madecassoside in the treatment of dermatitis is reflected in reducing the pro-inflammatory cytokines (IL-1β, TLR2), moreover, it can promote the secretion of AQP3, LOR, IVL in HaCaT keratinocytes and the secretion of HA in human skin fibroblasts, thus can significantly enhance skin hydration (Shen et al., 2019).