An allergic rash is hives or eczema, according to the American Academy of Allergy, Asthma and Immunology. Hives is an allergic skin reaction that causes red and itchy welts on the skin, according to MedlinePlus. Eczema is a condition triggered by allergens, dry skin and other irritants that causes inflammation in the skin, according to the Mayo Clinic. Hives and eczema have similar symptoms, yet have a different appearance. Talk with a doctor about any rashes that develop.
Cause
Both hives and eczema are the result of allergens that trigger an immune system reaction. Common triggers for hives and eczema are airborne allergens and food allergies, according to MedlinePlus. Airborne allergens are in the home or outdoors during springtime. These include mold spores, pollen, pet dander, cockroaches and dust mites. Nuts, seafood, eggs and dairy are common food allergies.
Hives Symptoms
Hives appear as swollen, red welts that have defined edges and are very itchy, according to MedlinePlus. As hives worsen, they spread to other areas of the skin and appear to move. Hives can change shape and move in a matter of minutes. They can join together to cover a large area of the skin or and then separate again. Hives will turn white when someone presses on them, and they can last for a few hours or days, depending on the cause.
Eczema Symptoms
Eczema symptoms include red or brownish colored patches that begin as small red dots, severe itching, raised bumps that can ooze and crust over if agitated. Thickened skin areas and raw skin from scratching form as a result of eczema, according to the Mayo Clinic. Eczema commonly appears on the hands and feet, but can develop anywhere on the body. It is an allergic condition in children under age 5, but rarely in adults.
Treatment
Identify the triggers of eczema and hives and avoid them, according to the Mayo Clinic. Use medication to manage symptoms. Topical corticosteroid creams reduce inflammation in the skin when the rash develops. If hives or eczema is the result of airborne allergens, a doctor may recommend taking a daily antihistamine to reduce histamine levels in the blood.
Consideration
The American Academy of Allergy, Asthma and Immunology recommends talking with an allergist about allergy rash symptoms. An allergist will perform an allergy test to determine the allergy triggers. Allergy shots may be a possible treatment for people suffering from severe allergic skin rashes.
