What term refers to the skin reaction that occurs when allergens come into physical contact with the skin?

The term that refers to the skin reaction that occurs when allergens come into physical contact with the skin is known as Contact Dermatitis. This condition arises specifically when an allergen or irritant triggers an inflammatory response upon direct exposure to the skin. It can manifest as redness, itching, and sometimes blistering in the area that came into contact with the offending substance.

While Allergic Dermatitis is a related term, it is a broader classification that specifically refers to the allergic reaction aspect, which can include factors beyond simple contact, such as systemic reactions or sensitivity from previously sensitized skin. Contact Dermatitis, however, clearly emphasizes the physical interaction with allergens and irritants.

Psoriasis and eczema are distinct skin conditions with different underlying mechanisms and symptoms. Psoriasis is characterized by rapid skin cell turnover leading to thick, scaly patches, while eczema encompasses a range of inflammatory skin conditions that can include dry, itchy skin, often with no direct allergic cause linked to contact.