A rash is a common symptom of a fish oil allergy, according to MayoClinic.com. After consuming fish oil, the rash will develop within a few minutes, or up to one hour. A rash from a fish oil allergy can manifest in three types of rashes: hives, eczema or general itching. Many fish oil supplements remove the fish proteins that commonly cause an allergic reaction. However, traces of the proteins can still be found in fish oil supplements, leading to an allergic reaction, according to MedlinePlus.
Cause
A rash from fish oil is caused by inflammation in the skin from increased levels of histamine. If a patient is allergic to fish oil, her body's immune system recognizes some element of the fish oil as dangerous. The immune system develops antibodies to fight off the fish oil. When the antibodies travel throughout the body, they initiate mast cells to produce histamine. Histamine is a naturally occurring chemical in the body that causes irritation and inflammation, according to MayoClinic.com.
Rashes
Hives are a common rash from an adverse reaction to fish oil. Hives are defined by the American College of Allergy, Asthma and Immunology as clusters of inflamed skin that appear as welts. Hives can come and go and migrate to different parts of the body for no reason. Eczema is another rash that can develop from fish oil. Eczema appears as small, red bumps that are extremely itchy. When scratched, eczema can crack open, weep and then crust over. General itching may also occur without inflammation.
Complications
As with any rash, extreme itching can lead to cracked skin. Cracked skin leaves the body vulnerable to secondary skin infections, such as impetigo. If the skin cracks from excessive scratching, cover the open wound with a bandage and keep the area clean. Permanent scarring is possible in extreme cases of eczema.
Treatment
Avoid consuming or coming into direct contact with fish oil, according to MayoClinic.com. According to the American Academy of Allergy, Asthma and Immunology, the best treatment to treat an allergic skin reaction is with steroid-based creams. Over-the-counter versions include hydrocortisone cream, which will reduce the inflammation and itching. In severe cases, a doctor may prescribe a corticosteroid lotion to calm the skin.
Consideration
Use caution when taking any supplement. A fish oil allergy can lead to anaphylaxis, an all-body allergic reaction that could result in death. If you experience extreme allergic reactions after taking fish oil supplements, seek medical attention immediately.
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