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Allergic Reaction Causes Rashes. The skin may become red. Substances that come into contact with the skin such as latex are also common causes of allergic reactions known as contact dermatitis or eczema. For example insect bites and autoimmune conditions along with fungal bacterial and viral infections can all cause a rash to appear. In some severe cases allergies can trigger a life-threatening reaction known as anaphylaxis.
Anaphylaxis is a rare life-threatening reaction to a drug allergy that causes the widespread dysfunction of body systems. An allergic reaction can affect nearly anyone at any time. From the WebMD Archives March 8 2006 – Jewelry metals and fragrances top the list of substances most likely to cause serious skin rashes Mayo Clinic dermatologists report. One of the most common causes of rashes contact dermatitis occurs when the skin has a reaction to something that it has touched. Skin allergies frequently cause rashes or swelling and inflammation within the skin in what is known as a weal and flare reaction characteristic of hives and angioedema. Some toxins also require ultraviolet radiations to activate the allergic reaction so its better to avoid sunlight exposure as soon as you come in contact with a poisonous plant.
In some severe cases allergies can trigger a life-threatening reaction known as anaphylaxis.
Taking medications may also cause rashes. These rashes can start a few days to more than a week after the first shot and are sometimes quite large. Some toxins also require ultraviolet radiations to activate the allergic reaction so its better to avoid sunlight exposure as soon as you come in contact with a poisonous plant. CDC has learned of reports that some people have experienced a red itchy swollen or painful rash where they got the shot. An allergic reaction can affect nearly anyone at any time. For example insect bites and autoimmune conditions along with fungal bacterial and viral infections can all cause a rash to appear.