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PHILADELPHIA (CBS) – Attention trick-or-treaters! For the fourth year, households across the United States will be participating in the Teal Pumpkin Project.

The Teal Pumpkin Project encourages people to place a teal pumpkin in front of their home to signal they have non-food treats available for trick-or-treaters with food allergies.

Many candies contain common allergens in children and adults; for example, nuts, milk, egg, soy or wheat.

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Households that participate in this project offer glow sticks or small toys as a substitute for candy.

The Teal Pumpkin Project was started by the Food Allergy Community of East Tennessee and is now supported by a list of organizations that include, Food Allergy Research & Education (FARE), Allergy & Asthma Network, CURED Foundation, and American Partnership for Eosinophilic Disorders.