Acute urticaria is when the rash and/or angioedema lasts anywhere from a few hours to less than 6 weeks. In most cases, it appears suddenly, lasts for a few hours or stays 4 to 5 days.
Acute urticaria is caused by mast cell activation and occurs mainly in small children in the context of a viral infection.
It can also occur with stress or great fatigue.
It can also be caused by taking medication such as aspirin or non-steroidal anti-inflammatory drugs.
Direct contact with plants (nettles) and animals (processionary caterpillars, jellyfish, etc.) can also trigger this type of hives.
Acute urticaria can be treated over one or two weeks. However, an allergological assessment will be necessary, if an allergy is suspected!