Irritation represents local tissue inflammation response to chemicals, without a systemic immunological component, and irritation is characterized by inflammation, redness, swelling, heat, or pain. Irritation testing is used to assess the potential of a medical device to cause an immediate irritation reaction in the skin, mucosal, or ocular tissues following a single or repeated exposure to the body. Irritation is one of the three most common biocompatibility tests required to ensure the safety of medical devices. https://www.ste-mart.com/irritation-testing.htm