Allergy spots are areas of the skin that become red, itchy, and inflamed in response to an allergen. There are many synonyms for allergy spots, including hives, welts, urticaria, rash, and eczema. Hives are a type of allergic response that appears as raised, itchy, red welts on the skin, while welts are flat, raised red patches. Urticaria is a medical term for hives or welts, and a rash is a general term for any type of skin irritation or inflammation. Eczema is a chronic skin condition that causes dry, itchy, scaly patches of skin that can become inflamed and irritated. If you experience allergy spots frequently, it is important to consult a healthcare professional to determine the underlying cause and receive proper treatment.