TSLP (Thymic Stromal Lymphopoietin): TSLP is a cytokine that plays a crucial role in initiating allergic inflammation and regulating immune responses at the epithelial barrier. It acts on dendritic cells, promoting a Th2-skewed immune response, which is central to the development of allergic conditions such as asthma, atopic dermatitis, and eosinophilic esophagitis. Research on TSLP emphasises its potential as a therapeutic target, with insights into its mechanisms providing opportunities for innovative treatments of these diseases.