Allergens can create allergic reactions upon skin contact, when they are taken a breath, ingested or infused. An allergy starts when you touch, inhale or swallow an allergen. In response to this trigger, the body begins making a type of healthy protein called IgE or immunoglobulin E. Allergies are quite usual and also may occur seconds to hours after contact with the allergen. Though lots of allergic reactions are mild, others might threaten or lethal.

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