Sweet syndrome or acute febrile neutrophilic dermatosis is a recurrent and rare skin disease caused by the release of cytokines, with diverse possible etiologic causes. It presents clinically with polymorphic skin lesions, fever, arthralgia, and peripheral leukocytosis. In general, it is associated with infections, malignancy and drugs. It usually regresses spontaneously and treatment is primarily to control the basic disease. The authors report the case of a child of 1 year and 11 months who developed Sweet syndrome.

In total, 4,552 patients (female 57.9% and mean age 38.6AE14.6) with CU were included in this retrospective cohort study. K-medoid algorithm was used for clustering CU patients. Kaplan-Meier survival analysis with Cox regression were applied to identify predictors of CU remission.