Skin patch testing is conducted to identify allergens responsible for contact dermatitis. The test involves applying small patches containing potential allergens to the skin, usually on the back. These patches remain in place for 48 hours, during which the patient must avoid activities that could dislodge the patches or cause sweating.

After 48 hours, the patches are removed, and the skin is examined for any reactions. A follow-up examination is typically conducted 72 to 96 hours after the initial application to check for delayed reactions. The presence of redness, swelling, or vesicles at the test sites indicates a positive reaction to a specific allergen. Skin patch testing helps identify substances that cause allergic contact dermatitis, guiding the patient in avoiding these allergens.

Insect Bites often cause a localized reaction on the skin, including redness, swelling, itching, and pain. The severity of these symptoms can vary depending on the type of insect, the individual's sensitivity, and whether the bite was from a venomous insect. Common insect bites from mosquitoes, fleas, and bedbugs typically result in small, itchy bumps that may become red and swollen. In some cases, scratching the bites can lead to secondary infections.