Final answer:
Eczema and contact dermatitis are examples of allergic skin diseases. Though acne and rosacea are skin disorders, they are not typically classed as allergies.
Step-by-step explanation:
Examples of allergic skin diseases include conditions like eczema and contact dermatitis. Eczema, which can manifest as dry, itchy patches of skin, is often considered an allergic reaction, although the exact link between eczema and allergies (like to dust mites) is not definitively proven. On the other hand, acne and rosacea, though skin disorders, are not typically classified as allergic skin diseases. Other skin conditions sometimes associated with allergies include hives and allergic contact dermatitis, which occurs when the skin comes into direct contact with an allergen.