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