IL18 and skin sensitization: In line with our previous findings, IL‐18, a keratinocyte‐derived chemokine that is related to contact sensitizer potency in reconstructed human skin epidermis,21 and CXCL12, a chemoattractant that is pivotal in mediating LCs migration during skin sensitization,48 were found to be higher in RHS than in RHG regardless of the presence of S. mitis.