Developing a rash is a common side effect of taking fish oil supplements. Most people take fish oil supplements to increase their daily intake of omega-3 fatty acids. Some people take fish oil supplements to treat specific medication conditions, such as high blood pressure, kidney disease and depression, according to MedlinePlus. You shouldn't use fish oil pills without a doctor's consent. A rash from taking fish oil may be a sign of an allergic reaction. All skin rashes related to taking fish oil need to be assessed by your doctor. An allergic reaction can be deadly.
Hives
Hives are a common side effect of taking fish oil supplements, if you're allergic to the supplement. Though hives can form without an allergic reaction, hives is an alarming symptom that needs to be evaluated by your doctor. Hives appear in clusters and form as welts throughout the skin. They're red in appearance and form a white circle in the middle of the welt when you press on it. According to Drugs.com, hives that form along with shortness of breath, facial swelling and an increased heart rate are related to an allergic reaction. Stop using fish oil supplements and consult your doctor if you develop any of these symptoms.
Eczema
Eczema is a common skin rash that can develop from taking fish oil supplements. Eczema forms as small blisters that ooze and crust. You may develop ear discharge or bleeding, raw areas of the skin, skin color changes and redness and inflammation of the skin, according to the U.S. National Library of Medicine. The skin can also become leathery and thick if you experience eczema often. This skin reaction is caused by a hypersensitivity of the skin that can be triggered by environmental factors, taking certain medications and dry skin. If you develop eczema after taking fish oil supplements, call your doctor.
General Irritation
MedlinePlus says you may develop minor skin rashes after taking fish oil supplements. Minor skin rashes are caused by irritation in the skin that may cause your skin to become itchy, inflamed or red for a short time. Minor skin irritations should still be observed by a physician to rule out any more serious rashes. If a rash doesn't subside within three days, see a doctor.
Treatment
Treatment for most skin rashes includes avoidance and medications. If you're allergic to fish oil supplements, discontinue use and use an alternative method of getting omega-3s. Hydrocortisone is the most common topical medication used to reduce itching and inflammation, according to the American Academy of Allergy, Asthma and Immunology.
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