What skin condition results from an allergic reaction or irritant exposure?

Contact dermatitis is the correct answer because it specifically arises from exposure to allergens or irritants that cause an inflammatory reaction in the skin. This condition can manifest as redness, itching, and blistering in the areas where the skin has come into contact with the offending substance.

In contrast, psoriasis is a chronic autoimmune condition characterized by the rapid growth of skin cells leading to scaling and inflammation, not typically triggered by allergens or irritants. Acne results from clogged pores and hormonal changes, rather than an allergic reaction or irritant. Rosacea is a chronic skin condition often resulting in facial redness and visible blood vessels but is not directly linked to exposure to allergens or irritants.

Therefore, contact dermatitis is distinctly associated with allergic reactions or irritant exposures, making it the most appropriate choice.