Final answer:
The medical term for 'hives' is urticaria, which is a condition manifested by itchy, raised welts on the skin; and is a type of type I hypersensitivity reaction. Allergists identify allergens causing urticaria through skin testing, observing the 'wheal and flare' response. Eczema, although similar as an allergic skin reaction, differs from hives in presentation and chronicity.
Step-by-step explanation:
The medical term for hives, which is an allergic reaction rash, is urticaria. This condition is characterized by the development of itchy, raised, red or skin-colored welts on the skin's surface. Hives are a common reaction and can be caused by various triggers including certain foods, medications, or other allergens. Urticaria can be part of type I hypersensitivity reactions, similar to those associated with conditions like hay fever, food allergies, and atopic dermatitis.In the diagnosis and management of allergies, allergists often perform skin testing to identify specific allergens. For instance, when a person is suspected to have an allergy, allergen extracts are introduced into the epidermis and the presence of a 'wheal and flare' response, which involves a soft swelling surrounded by a red zone due to histamine release, confirms the allergy. When it comes to hives, this response is crucial in pinpointing the triggering allergen.Another skin condition often confused with hives is eczema, which is also an allergic reaction in the form of dry, itchy patches of skin. However, eczema is more chronic and usually presents with flaking and sometimes bleeding, whereas hives are typically acute and exhibit as swellings or welts.