Acute urticaria affecting an arm. Also called hives or nettle rash,urticaria is a transient swelling and/or flushing of the skin. The underlying vasodilation & accumulation of tissue fluid in the dermis develops as an allergic reaction,which ranges in size from small spots to patches several inches across; it is intensely itchy & lasts anything from a few minutes to several days. There are a variety of types of urticaria. Contact urticaria,for example,is a weal & flare reaction that lasts for minutes following skin contact with a number of agents such as nettles | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Marazzi, Dr. P. |
Taille de l’image : | 5163 px × 3324 px |
Model Release : | Disponible |
Property Release : | Non requis |
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