Final answer:
Urticaria, also known as hives, is the disorder caused by food allergies and insect bites. It is characterized by itchy welts on the skin. Allergies occur when the immune system reacts hypersensitively to typically harmless substances, leading to a variety of symptoms.
Step-by-step explanation:
The disorder caused by food allergies and insect bites, otherwise known as hives, is b) Urticaria. Urticaria is an allergic reaction that results in raised, red, itchy welts or hives on the skin. Allergies are due to hypersensitivity of the immune system to substances that are usually harmless, such as pollen, dust mites, mold, animal dander, and certain foods like shellfish and peanuts. When the body encounters an allergen, it can cause localized or systemic reactions, leading to symptoms like swelling, rash, and anaphylaxis in severe cases.
Other skin-related allergic reactions include eczema, which is characterized by dry, itchy skin that can sometimes lead to bleeding, and contact dermatitis, which is an itchy rash caused by direct contact with an allergen like poison ivy.
Managing the symptoms of allergies can vary depending on the type, but it often involves avoiding known allergens, using antihistamines, and in some cases, employing immunosuppressants or corticosteroid creams for skin reactions.