Allergy Patch Testing
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What is Patch Testing?
Patch testing is a specialised diagnostic test designed to identify the specific allergens or irritants that cause contact dermatitis. By exposing the skin to small amounts of various allergen substances, this test pinpoints the exact cause of your skin reaction. At Cathedral Dermatology, we partner with the Allergy Clinic to offer comprehensive patch testing services, ensuring accurate diagnosis and effective treatment for contact dermatitis.
Why is Patch Testing Important?
Identifying the specific substances causing your contact dermatitis is crucial for effective management and prevention of relapse.
Patch testing can:
Determine the cause
Identifying your exact allergen(s) or irritant(s) informs you as to what product ingredients you are allergic to
Prevent future reactions
Knowing what triggers your dermatitis allows you to avoid those substances, reducing the likelihood of future flare-ups
Guide treatment
Helps your dermatologist create a personalised care plan tailored to your specific needs, whilst avoiding products that might make your skin worse
Patch Testing Procedure
Initial Consultation
Your patch testing journey begins with an initial consultation at Cathedral Dermatology, where our dermatologist will review your medical history, to understand your symptoms, lifestyle and exposure to potential allergens. A physical examination will also be conducted to assess the affected areas of your skin. A list of possible allergen bundles will be collated and then we will arrange for you to be tested against these.
Preparation
Before the patch testing, you may need to avoid certain medications or skincare products that could interfere with the results. Your dermatologist and the patch testing nurse will provide detailed instructions on how to prepare for your test.
Application
On the first visit (Monday), Patches are applied to your back in special small disc (about 1cm in diameter) containers held in place by hypoallergenic tape.
The location of the containers is identified by marking your back with ink. Itching of the test areas is normal, but you are strongly advised not to scratch. You should allow up to 45 minutes for this first visit. You must keep the patch test and tape dry and avoid showering and bathing until after your day 5 visit with Dr Murphy.
Follow-Up Visits
The substances will remain taped in place until your next visit 2 days later (Wednesday), when the taping is removed and any reactions noted.
A final ‘day 5’ appointment will be scheduled with Dr Murphy on the Friday, during which he will read your back to obtain and then interpret the results of the patch test, identifying which substances caused a reaction. Details of positive allergens, in the form of an information leaflet or QR code, will be provided for your own reference and to help you work out what products they might be contained in so you can avoid them.
