An allergy skin test helps identify triggers for one's allergic reactions. Small amounts of allergy-provoking substances (allergens) are scratched into the skin. Redness and swelling develop if one is allergic to the substance. A positive allergy skin test implies that the person has an IgE antibody response to that substance. The test is rapid, simple, and relatively safe. Read more: Skin Test for Allergy Article
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Related Disease Conditions
The word "rash" means an outbreak of red bumps on the body. The way people use this term, "a rash" can refer to many different skin conditions. The most common of these are scaly patches of skin and red, itchy bumps or patches all over the place.
Hives, also called urticaria, is a raised, itchy area of skin that is usually a sign of an allergic reaction. The allergy may be to food or medications, but usually the cause of the allergy (the allergen) is unknown.
Poison Ivy, Oak, and Sumac
Poison ivy, oak, and sumac contain a substance called urushiol, which causes a rash on people who come in contact with them. Symptoms and signs include a red, swollen, itchy, blistering, bumpy rash. Treatment involves rinsing the exposed area with water, taking antihistamines and over-the-counter pain medications, using topical treatments such as calamine lotion, and applying cool compresses.
Eczema is a general term for many types dermatitis (skin inflammation). Atopic dermatitis is the most common of the many types of eczema. Other types of eczema include: contact eczema, allergic contact eczema, seborrheic eczema, nummular eczema, stasis dermatitis, and dyshidrotic eczema.
An allergy refers to a misguided reaction by our immune system in response to bodily contact with certain foreign substances. When these allergens come in contact with the body, it causes the immune system to develop an allergic reaction in people who are allergic to it. It is estimated that 50 million North Americans are affected by allergic conditions. The parts of the body that are prone to react to allergies include the eyes, nose, lungs, skin, and stomach. Common allergic disorders include hay fever, asthma, allergic eyes, allergic eczema, hives, and allergic shock.
What Are the Four Types of Allergic Reactions?
Allergists recognize four types of allergic reactions: Type I or anaphylactic reactions, type II or cytotoxic reactions, type III or immunocomplex reactions and type IV or cell-mediated reactions.
Eczema refers to skin inflammation. There are many different types of eczema that produce symptoms and signs that range from oozing blisters to crusty plaques of skin. Treatment varies depending upon the type of eczema the person has.
Asthma is a condition in which hyperreactive airways constrict and result in symptoms like wheezing, coughing, and shortness of breath. Causes of asthma include genetics, environmental factors, personal history of allergies, and other factors. Asthma is diagnosed by a physician based on a patient's family history and results from lung function tests and other exams. Inhaled corticosteroids (ICS) and long-acting bronchodilators (LABAs) are used in the treatment of asthma. Generally, the prognosis for a patient with asthma is good. Exposure to allergens found on farms may protect against asthma symptoms.
How Long Does an Allergic Reaction Last?
Allergic reactions may last for varying lengths of time. They may take a few hours to a few days to disappear. If the exposure to the allergen continues, such as during a spring pollen season, allergic reactions may last for longer periods such as a few weeks to months.
Burning Mouth Syndrome (BMS)
Burning mouth syndrome (BMS) is a condition that causes pain in the mouth. BMS may be caused by menopause, dry mouth or allergies. Signs and symptoms include tingling or numbness of the tip of the tongue, bitter or metallic taste, and dry or sore mouth. Treatment depends upon the cause of your burning mouth syndrome.
Hay Fever (Allergic Rhinitis)
Hay fever (allergic rhinitis) is an irritation of the nose caused by pollen and is associated with the following allergic symptoms: nasal congestion, runny nose, sneezing, eye and nose itching, and tearing eyes. Avoidance of known allergens is the recommended treatment, but if this is not possible, antihistamines, decongestants, and nasal sprays may help alleviate symptoms.
The most common food allergies are to eggs, nuts, milk, peanuts, fish, shellfish, strawberries and tomatoes. Symptoms and signs of a food allergy reaction include nausea, vomiting, diarrhea, abdominal pain, itching, hives, eczema, asthma, lightheadedness, and anaphylaxis. Allergy skin tests, RAST, and ELISA tests may be used to diagnose a food allergy. Though dietary avoidance may be sufficient treatment for mild allergies, the use of an Epipen may be necessary for severe food allergies.
Children's Cough Causes and Treatments
Children's cough causes include infection, acid reflux, asthma, allergies or sinus infection, whooping cough, and exposure to irritants. Treatment for a child's cough include cough medicine for children over the age of four.
Why Do Hippies Smell Like Patchouli?
Patchouli oil has been in use for thousands of years, but it gained tremendous popularity because of its use by the hippies in the 1960s. Experts suggest that regular use of patchouli oil by hippies is because of the raw, earthy and natural nature of this oil. Hippies preferred using products that were not artificially manufactured and were cruelty free.
Insect Sting Allergies
The majority of stinging insects in the United States are from bees, yellow jackets, hornets, wasps, and fire ants. Severity of reactions to stings varies greatly. Avoidance and prompt treatment are essential. In selected cases, allergy injection therapy is highly effective.
Peanut allergies causes signs and symptoms that include hives, itching, redness, and a rash. Severe reactions may cause decreased blood pressure, lightheadedness, difficulty breathing, nausea, and behavioral changes. Someone with a peanut allergy should have an EpiPen with them at all times.
What Is Allergic Cascade?
The allergic cascade refers to allergic reactions that happen in the body in response to allergens. A variety of immune cells and chemical messengers participate in the allergic cascade. Symptoms of the allergic cascade range from mild swelling and itching to full-blown anaphylactic shock. Allergen avoidance and medications are used to prevent or treat allergies.
Sinus Infection vs. Allergies
Both sinus infections and allergies (allergic rhinitis) cause symptoms such as runny or stuffy nose and fatigue. Sinus infection (known as sinusitis) is inflammation of the sinuses, caused by infection from bacteria, viruses, and/or fungi (molds). Allergic rhinitis occurs when certain allergies cause nasal symptoms. When a person with allergies breathes in an allergen, such as pollen, dust, or animal dander, symptoms such as runny or stuffy nose, itching, sneezing, and fatigue occur.
Drug Allergy (Medication Allergy)
Drug or medication allergies are caused when the immune system mistakenly creates an immune response to a medication. Symptoms of a drug allergic reaction include hives, rash, itchy skin or eyes, dizziness, nausea, diarrhea, fainting, and anxiety. The most common drugs that people are allergic to include penicillins and penicillin type drugs, sulfa drugs, insulin, and iodine. Treatment may involve antihistamines or corticosteroids. An EpiPen may be used for life-threatening anaphylactic symptoms.
Latex allergy is a condition where the body reacts to latex, a natural product derived from the rubber tree. The reaction can either be delayed and cause a skin rash or immediate, which can lead to anaphylaxis. Avoiding latex is the most effective way to prevent an allergic reaction.
What Foods Cause Oral Allergy Syndrome?
Oral allergy syndrome, also called pollen food allergy syndrome or PFAS, is a type of food allergy caused by certain allergens found in both pollen and raw vegetables and fruits and some nuts. Foods that cause oral allergy syndrome include those in the birch, grass and ragweed families.
How Do You Know if You Are Allergic to Pollen?
Pollen is a powdery yellow grain that fertilizes other plants of the same species. The only way to know for sure if a person has pollen allergy is to see a board-certified allergist for allergy testing.
Are Food Allergies Passed Down Genetically?
A food allergy is a condition that causes your immune system to fight against a particular part of food — which is called an allergen. Food allergies can be hereditary — that is, parents can pass the likelihood of developing a food allergy to their children through genes that code for inherited traits.
Local ResourcesFind a local Asthma & Allergy Specialist in your town
Treatment & Diagnosis
Medications & Supplements
- Ondansetron (Zofran) vs. promethazine (Phenergan)
- Side Effects of Xyzal (levocetirizine dihydrochloride)
- Claritin (loratadine) vs. Zyrtec (cetirizine)
- Side Effects of Vistaril (hydroxyzine)
- Does Immunotherapy Work for Allergies?
- Side Effects of Periactin (cyproheptadine)
- Side Effects of EpiPen (auto-injectable epinephrine)
- Xyzal (levocetirizine dihydrochloride)
- Beconase AQ (beclomethasone) Side Effects, Warnings, and Drug Interactions
- Cutivate (fluticasone propionate)
- Side Effects of Rhinocort Aqua (budesonide)
- Side Effects of Auvi-Q (auto-injectable epinephrine)
- Quzyttir (cetirizine)
- Kalbitor (ecallantide) Injection
- Symjepi (epinephrine)
Prevention & Wellness
- An Allergist Offers His Expert Advice for a Sneeze-Free Spring
- Don't Let Bugs Dampen Your Outdoor Fun
- Don't Let Ticks Get Under Your Skin
- Bed Bugs' Ancestors Were Creeping Near People 11,000 Years Ago
- Don't Believe Everything You Read on Skin-Care Product Labels
- Skin Allergies Can Flare Up in Summer Heat