IL4 and dermatitis: Since TSLP receptors are expressed in various immune cells, including ILC2s, the TSLP-TSLP receptor interaction activates ILC2s to produce type 2 cytokines, such as IL-4, IL-5, and IL-13 [10] and stimulates eosinophils [11], basophils [12,13], and dendritic cells [14], which eventually causes AD-like skin inflammation.