“…In this issue's POPS, Wu et al 39 from University Hospitals Cleveland Medical Center lead the reader through this learning process, illustrating the complexity of the differential diagnostic process for this clinical presentation and the importance of a detailed history, physical examination, and appropriate laboratory assessment in arriving at a correct diagnosis. 39 In summary, the collection of articles found within the pages of this issue provides further insight into the intersecting crossroads of genetics and the environment that manifest as the allergic, cutaneous, and respiratory disorders that afflict patients served by the allergist/immunologist. In particular, these articles exemplify how the complexities of asthma, allergic rhinitis, CU, HAE, immunodeficiency, and food allergy continue to challenge the allergist/immunologist.…”