荨麻疹也被称为风团，其特征为出现剧烈瘙痒性红色斑块。 临床上表现为浅层真皮瘙痒、苍白、褪色性肿胀，持续时间长达 24 小时。病变皮损可能较小、较大、巨形、呈椭圆形或环状。
慢性荨麻疹被分为 2 种亚型：
Assistant Professor of Clinical Pediatrics, Clinician Educator
Director, Quality Improvement and Educational Activities For The Breathmobile Program
Keck School of Medicine, USC
ML has no competing interests.
Clinical Associate Professor of Pediatrics
Division of Allergy-Immunology
Los Angeles County+USC Medical Center
KYCK is a consultant and independent contractor for Thermo-Fisher Scientific.
Dr Marilyn Li and Dr Kenny Y.C. Kwong would like to gratefully acknowledge Dr Nanette Silverberg, and Dr Mary Lee-Wong, previous contributors to this topic. NS and MLW declare that they have no competing interests.
Pediatrics and Internal Medicine
Division of Allergy and Immunology
CP declares that he has no competing interests.
New York University School of Medicine
AK declares that he has no competing interests.
Head of Allergy Division
Department of Dermatology and Allergy
Hannover Medical School
BW declares that she has no competing interests.