What is the term for a skin disorder caused by repeated usage of a product?

The correct answer is contact dermatitis, which specifically refers to an inflammatory skin condition that occurs due to direct contact with an irritant or an allergen. This can happen when a product is applied repeatedly over time, triggering an inflammatory response in the skin. Contact dermatitis is characterized by redness, irritation, and sometimes swelling or blisters in the affected areas.

Allergic dermatitis, on the other hand, is a type of contact dermatitis that arises due to an allergic reaction to a substance rather than irritation from repeated contact. While atopic dermatitis is a chronic condition linked to genetic factors and often associated with dry skin and eczema, it doesn't typically involve a direct causal relationship with product usage. Dermatitis is a broader term that encompasses various types of skin inflammation, including both contact dermatitis and atopic dermatitis, but it lacks the specificity to denote the context of repeated product use that contact dermatitis clearly conveys.