Contact dermatitis is a type of skin inflammation that occurs when the skin comes into direct contact with an irritant or an allergen. Symptoms of contact dermatitis may include redness, itching, burning, swelling, and blisters. Diagnosis of contact dermatitis is usually based on the patient's history, physical examination, and skin patch tests. Treatment for contact dermatitis may include topical corticosteroids, antihistamines, and moisturizers. In some cases, further tests may be needed to determine the underlying cause of the condition and to rule out any other possible skin conditions.