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Allergic Reactions With Skin Blotches

author image Evelyn Broderick
Evelyn Broderick has been a writer since 2004. Her work has been published by the Jewish Alliance for Women in Science. She holds a Bachelor of Science in chemistry and biology from Macaulay Honors College and is pursuing an M.D./Ph.D. in immunology at Sloan Kettering. She is also a member of the New York Academy of Sciences.
Allergic Reactions With Skin Blotches
Many skin rashes are caused by allergic reactions. Photo Credit: Mustafa Arican/iStock/Getty Images

There are several types of allergic reactions that can cause skin blotches. Most of these reactions are not serious or life threatening but can cause pain, discomfort and embarrassment. Medical treatment can help alleviate these reactions and prevent them in the future. Understanding the several forms of allergic reactions will help you determine if your skin blotches are being caused by an allergic reaction.

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Hives can be caused by allergic reactions to foods like shellfish and nuts or as reactions to medications and insect bites. Hives look like pink red bumps and raised patches on the skin. These patches are often itchy and may even burn or sting. They occur on any part of the body and vary in both size and shape. Hives are also known as urticaria.

Allergic Contact Dermatitis

Allergic contact dermatitis occurs after your skin touches an allergen. Common allergens that cause contact dermatitis include nickel jewelry, perfume and latex. Skin becomes itchy and red with bumps and scales. The rash is located near the area of contact with the allergen.


Eczema is also known as atopic dermatitis. This is a chronic condition caused by immune dysfunction. Eczema usually first appears in early childhood and is often associated with asthma, allergic rhinitis or food allergy. Eczema most commonly appears on the face, neck, trunk and limbs as patches of itchy, inflamed skin.

Allergic Purpura

Allergic purpura is a serious reaction to drugs and medicines. It causes spots on the skin that range from small red dots and larger bruise like spots. It occurs after taking the causative medication. Allergic purpura is very serious and you should see your doctor right way if you suspect you have allergic purpura.

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