Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

This content is selected and controlled by WebMD's editorial staff and is brought to you by AVEENO®.

How to Find a Food Trigger continued...

Skin testing. A doctor can take an extract of the food and use it to scratch the skin lightly. If the area swells up, it's a sign of an allergic reaction. However, sometimes it's not accurate.

Blood tests. RAST -- radioallergosorbent test -- can check for special cells in the blood that are signs of specific food allergies. Generally it’s less accurate than skin tests. Other lab tests can check for cells that trigger swelling.

Tracking down a food trigger can take patience and detective work.

Be methodical. Eliminate only one food at a time. If you ban dairy and gluten at the same time and symptoms get better, you'll have no idea which one made the difference. Use a food diary to record foods and symptoms.

Move slowly. Accommodating a food allergy isn't easy. And eliminating too many foods could also cut out important nutrients your child needs to grow and develop. So for your child's sake and yours, be certain before eliminating a food from your child's diet permanently. Work with your doctor. Remember that a positive skin test isn't reason enough to cut out a food -- lots of kids test positive for foods that don't really cause symptoms.


Keep using other treatments. Even if your child does have an eczema trigger food, cutting it out may not make the rash disappear. So continue the other treatments your doctor recommends -- like skin ointments, lotions, medications, and avoiding other allergens like dust mites, pollen, or pet dander.