Hives, otherwise known as urticaria is an itchy, red blotchy rash in the skin. This blotchy rash produces distinctive weal’s on the skin that can appear in specific areas or all over the body. In about 50 percent of urticaria cases we do not know what causes this rash. The triggers for this rash results in the skin becoming red and swollen and there is a release of histamine from mast cells, which gives rise to the itching sensation felt in the skin. Urticaria can be due to immunological factors such as allergies that can trigger the release of this histamine, but there can also be non-immunological causes and these include: solar rays and the heat that you have mentioned. Also the cold, physical pressure and even exercise can trigger an urticarial rash.
Urticaria can present itself in an acute and chronic form, but also in an intermittent presentation. Acute urticaria generally subsides within 48hrs and chronic urticaria persists for more than six weeks. We are unable to diagnose your condition and therefore we would suggest a review with your general practitioner.
Answered by the Health at Hand nurses
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