One of the primary symptoms of a seafood allergy is itchy skin, according to MayoClinic.com. The symptom may begin as a tingling in or around the mouth and develop into an allergic skin rash or general inflammation. Seafood allergy symptoms can range from minor to severe -- such as anaphylactic shock. Anaphylaxis from a seafood allergy accounts for around 200 deaths annually in the United States, according to the Asthma and Allergy Foundation of America. If you suspect that you're allergic to seafood, talk with your doctor for an evaluation.
The Cause
The cause of itchy skin from a seafood allergy is from increased levels of histamine in the surface of the skin. Histamine is a naturally-occurring chemical in the body that helps protect against infection. During an allergic reaction, your body mistakes the proteins in the seafood as a dangerous substance and begins to defend itself by creating certain antibodies that attempt fight them off. The introduction of these antibodies into the body causes mast cells to produce histamine, which leads to inflammation, irritation and itchiness of the skin and other parts of the body.
Hives
A common rash that develops from a seafood allergy is hives. Hives can form anywhere on the body, but will most likely develop on the face. Hives appear in clusters in different sizes and shapes and may be difficult to identify. They are extremely itchy and can appear, disappear and re-appear for no reason. Hives typically do not last longer than 12 hours. If your hives persist for more than a day, you should contact your doctor for an assessment.
Eczema
If you're allergic to seafood, eating it can result in a outbreak of eczema, another common skin rash that causes itchy skin. Eczema is a chronic skin condition triggered by certain elements; allergies are a common trigger. Eczema will form as blisters anywhere on the body. If you scratch the blisters, they can pop, weep and crust over. This skin condition can leave your skin scaly, leathery and scarred if you do not properly treat it.
Warning
A skin rash may be a sign of anaphylactic shock, a severe and potentially life-threatening allergic condition. Other signs of anaphylaxis include a sudden drop in blood pressure, the inability to breathe, dizziness, bluish-color skin, mental confusion and an increased heart rate. If you notice any of these symptoms developing, call 911 immediately.
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