cheek rash that looks like child was slapped

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My doctor suggested allergy testing after severe rashes after taking two different classes of antibiotics. What exactly is involved in that?

Usually

after giving a good history of allergic symptoms / situation, you get about 100 tiny needle pokes w/different antigens (things you might be allergic to). Then you sit and wait for several minutes. If you are allergic to something tested, will seem longer b/c will start to itch/swell in spot where stuck. Test read by size of reactions around each poke & Allergist interprets +/- and goes over w/you.
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What happens if a child has an anaphylactic reaction during allergy testing at the allergist's office?

Epinephrine

Anaphylaxis is primarily treated with epinephrine injection. The allergist's office should be prepared for this rare risk and have various medications ready. It is also important not to test at the wrong time such as during an acute infection or asthma exacerbation.
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Dr. Lee M. Perry answered:

What happens if a child has an anaphylactic reaction during allergy testing? What's the antidote?

Stop testing + Epi

Anaphylactic_shock_
The testing would need to be stopped immediately, and treatment for anaphylaxis would need to be initiated (injectable epinephrine, benadryl, possibly steroids).
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Dr. Jordan M. Rush answered:

Why would I develop heartburn after starting PPIs? Had severe allergies/asthma since child, was told (despite allergy testing) that it might be GERD

Heartburn

Gastroesophageal_reflux_disease
Why were you started on PPIs in the first place? Given your history of allergies and esophageal symptoms this raises the suspicion of a condition called eosinophilic esophagitis that has symptoms that may overlap with GERD
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Is there such a thing as allergy testing for migraines?

Migraine & allergy

Allergy_tests
Great question, actually. A large number of people have migraines (up to 10%), and even more have allergies (25%). Migraines and allergies each have their own triggers. So we don't generally do allergy tests for migraine patients' headaches. BUT, a migraine sufferer who also has allergies should have them treated, because they can aggravate migraines and decrease quality of life significantly.
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Does allergy testing detect all allergies?

No

Allergy_tests
Appropriate allergy testing is guided by the patients history and physical examination. Based upon this one's allergist will make a decision what to be tested for. The test, particularly for outdoor allergens is based upon the common allergens is that particular agricultural zone. Does this mean that all allergens will be tested no.
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Dr. Susan Mathison answered:

I have to go for allergy testing tomorrow. what happens to me during and after?

Allergy testing

There are several different kinds of allergy testing. One is a simple blood draw....takes a few days to get results back, the others are via skin testing......you likely have avoided anti-histamines like loratidine and ceterizine. These tests can take up to an hour, but results are know right away. Your arm will have some reddish bumps if you are allergic, These will decrease in a day or so.
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Dr. Paul M. Carter answered:

I have to go for allergy testing tomorrow. what happens if I have a really major reaction?

Allergy Testing

Skin_allergy_test
Allergy testing is designed to cause a small skin reaction, but rarely ever causes any other symptoms. You have very very minimal chance of a "major" reaction. Only itching where the test is placed. This can be treated with topicals and an oral antihistamine and resolves fairly quickly.
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Dr. Gary C. Steven answered:

How can allergy testing work?

Skin prick testing

Allergies
There are several ways to do skin testing, but this is how it's done in my office: https://www.youtube.com/watch?v=Rv29BQDpaOc&list=UUhbDGeTAyJ63Q1tSyR1YYKg&index=9
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