As skin care providers, it is important for us to excel in the diagnosis and management of allergic contact dermatitis (ACD) – a common skin condition that affects many people. Fortunately, the patch test is a valuable method that helps us identify the allergens responsible for triggering ACD. At SkinCare Physicians, we routinely use patch tests to diagnose patients with skin rashes. In this post, Katie Brodt, one of our nurses and patch test expert, will explain ACD and walk you through the patch test process.
Understanding Allergic Contact Dermatitis (ACD)
ACD occurs when the skin comes into contact with substances capable of provoking an immune response in susceptible individuals. Common allergens that can cause an allergic reaction include fragrances, preservatives, metals and various chemicals found in personal care products, cosmetics and industrial materials. Identification of the specific allergen(s) is crucial for effective management and prevention of ACD recurrence.
The role of patch testing
Patch testing is a diagnostic method specifically designed to detect allergens responsible for ACD. By applying a series of standardized allergens to the patient’s skin, we can determine which substances cause a delayed skin hypersensitivity reaction. This information enables us to develop personalized treatment plans, including avoidance strategies and allergen-specific immunotherapy.
The process of patch testing
- Patient screening: We carefully select patients suspected of having ACD based on medical history, symptoms, and the absence of active skin disease that might affect the interpretation of the test.
- Patch test boards: Our providers use standardized patch test panels that include a wide range of common allergens. The panels contain 98 substances, some of which may be related to the patient’s work, hobbies, and related exposures.
- Patch application: We carefully apply patches containing small amounts of allergenic substances to the patient’s upper back using appropriate techniques. We ensure careful adherence to patch placement and timing protocols.
- Reading and interpretation: After 48 hours, patients return to our office so we can remove the patches and evaluate the skin for any initial positive reactions. Follow up with a final measurement in one week as allergic reactions can develop slowly. We then interpret the results based on standardized scoring systems for consistency and accuracy.
Personalized allergen avoidance
Identifying the specific allergens enables us to guide you in avoiding exposure to the substances that cause your allergic skin reaction. We will also recommend alternative skin care products or offer advice on adapting work practices to help you significantly reduce your risk of an ACD flare-up. In addition, we will create a profile for you at Skinsafe Products website where we will enter your specific allergens, helping you find ‘safe’ products to buy and use.
If you are suffering from an allergic skin reaction, know that we can help you diagnose the cause of your rash. Consider making an appointment with one of the experienced providers at SkinCare Physicians to see if you are a candidate for patch testing.
