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What type of allergic reaction occurs on the skin due to ingredients applied topically?

  1. Contact dermatitis

  2. Allergic dermatitis

  3. Atopic dermatitis

  4. Urticaria

The correct answer is: Contact dermatitis

Contact dermatitis is the correct answer as it specifically refers to the skin reactions that occur when an allergen or irritant comes into direct contact with the skin. This condition can manifest as redness, swelling, itching, or blistering in the area where the substance was applied. It is a localized reaction that can be triggered by various substances like cosmetics, skincare products, or even certain plants. Allergic dermatitis is often used interchangeably with contact dermatitis, but it typically refers to an allergic response to a specific agent following previous sensitization, which fits within the broader umbrella of contact dermatitis. Atopic dermatitis is a chronic condition linked more to internal factors, like genetics and environmental triggers, rather than direct contact with allergens. Urticaria, commonly known as hives, presents as raised welts on the skin but is not specifically related to topical applications and can often be triggered by a variety of internal and external factors, including stress or food allergens. In summary, contact dermatitis is the most direct answer related to skin reactions resulting from topical exposure to allergens.