Final answer:
Contact dermatitis is the homoeostatic imbalance caused by exposure to chemicals, resulting in a type IV hypersensitivity reaction characterized by a red, itchy rash.
Step-by-step explanation:
The homoeostatic imbalance caused by skin exposure to chemicals is Contact dermatitis. This condition is a type IV hypersensitivity reaction that occurs when the skin comes in contact with irritants or allergens. Symptoms of contact dermatitis include a red, itchy rash that may present blisters or dry, flaky skin. It can result from exposure to various substances, including latex, poison ivy, or certain beauty and cleaning products. Unlike some skin conditions, which may be due to poor hygiene or fungal infections, contact dermatitis is specifically triggered by contact with certain chemicals or substances.