Patch Testing for Skin Allergies
If you’re experiencing persistent or unexplained skin irritation, rashes, or eczema, you may be suffering from allergic contact dermatitis. Patch testing is a valuable diagnostic tool that helps us identify specific substances causing allergic reactions on your skin.
What Is Patch Testing?
Patch testing is a method used to detect delayed allergic reactions to substances that come into contact with the skin. Unlike a prick test, which checks for immediate allergic responses (such as food or environmental allergies), patch testing helps determine if certain ingredients in personal care products, household items, or workplace materials are triggering your symptoms.
What Does Patch Testing Identify?
Patch testing evaluates your skin’s reaction to a wide range of potential allergens. Common culprits include:
- Fragrances
- Preservatives
- Dyes
- Metals (such as nickel)
- Rubber chemicals
- Ingredients in skincare and cosmetic products
- Adhesives and other occupational allergens
By identifying the specific allergens causing your skin reaction, we can help you avoid future flare-ups and tailor a treatment plan suited to your needs.
The T.R.U.E. Test: A Trusted Method
At Turner Dermatology, we use the T.R.U.E. (Thin-layer Rapid Use Epicutaneous) Test, a standardized and FDA-approved patch testing method. The T.R.U.E. Test consists of three adhesive panels that contain 35 of the most common contact allergens, along with a control substance. Each panel is applied to your back and worn for 48 hours. After this period, you’ll return to the clinic for the first reading, and a second reading is typically performed 2–4 days later to detect any delayed reactions.
What to Expect During the Procedure
- Application – The T.R.U.E. Test panels are applied to clean skin on your back. You’ll be asked to avoid showering or heavy sweating while the test is in place.
- Initial Reading (48 Hours Later) – The patches are removed and your skin is examined for any reactions.
- Final Reading (72–96 Hours Later) – A follow-up exam is conducted to check for delayed allergic responses.
Throughout the process, you’ll receive detailed guidance on how to care for the test area and what to watch for in terms of reactions.
Take the Guesswork Out of Your Skin Care
Patch testing can be a crucial step in managing chronic skin conditions and preventing future outbreaks. If you think you might benefit from patch testing, schedule a consultation with our office today!