Urticaria (Hives/“bommels”) are reddish pink swellings or “wheals” that occur in crops on any part of the skin. The rash “blanches”: it becomes fainter when pressed by a finger. Each wheal lasts a few hours before fading away, leaving no traces. New hives appear in other places while some are getting better so it looks as if the wheals move from place to place. Wheals can vary in size from 1 mm to many centimetres and may be round or have a wavy border. Hives are usually very itchy.