weigh in. Be weighed; also, be of a particular weight. For example, Because it was such a small plane, the passengers and their luggage had to weigh in before takeoff , or The fish weighed in at 18 pounds. [Late 1800s] See also: weigh.
Asthma and allergic diseases, such as allergic rhinitis (hay fever), food allergy, and atopic dermatitis (eczema), are common for all age groups in the United States.
Contact dermatitis causes. There are two types of contact dermatitis: allergic and irritant. Like all allergic reactions, allergic contact dermatitis results from a reaction of the immune system. The immune system overreacts to the substance, usually an animal or vegetable protein. The immune system is activated to produce antibodies against this allergen.