Sedating fish

Posted by / 24-Nov-2017 10:32

Sedating fish

Welts (raised areas surrounded by a red base) from hives can appear anywhere on the surface of the skin.Whether the trigger is allergic or not, a complex release of inflammatory mediators, including histamine from cutaneous mast cells, results in fluid leakage from superficial blood vessels.Although this appears to be very similar to dermatographism, the cardinal difference is that the swelled skin areas do not become visible quickly and tend to last much longer. Cholinergic urticaria (CU) is one of the physical urticaria which is provoked during sweating events such as exercise, bathing, staying in a heated environment, or emotional stress.

The rash that develops from poison ivy, poison oak, and poison sumac contact is commonly mistaken for urticaria.Dermatographism is the most common form of a subset of chronic hives, acknowledged as "physical hives".It stands in contrast to the linear reddening that does not itch seen in healthy people who are scratched.Dermatographic urticaria (also known as dermatographism or "skin writing") is marked by the appearance of weals or welts on the skin as a result of scratching or firm stroking of the skin.Seen in 4–5% of the population, it is one of the most common types of urticaria, The skin reaction usually becomes evident soon after the scratching, and disappears within 30 minutes.

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