IL33 and urticaria: Moving to CSU, a recent study measured serum levels of the three major epithelium-derived cytokines (IL-33, IL-25, and TSLP) in 50 CSU patients and 38 healthy controls, aiming to explore their roles in disease severity, measured by the Urticaria Activity Score (UAS7), and the impact on the Dermatology Life Quality Index (DLQI).