--- title: "Patch Testing in Crawley – 21 RUSSELL" description: "Expert patch testing to identify allergens causing contact dermatitis. Multi-day diagnostic service with professional reading and guidance." canonical: "https://www.twentyonerussell.com/services/patch-test" --- ![Blonde woman with layered haircut and long side-swept fringe in salon setting](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fblonde-layered-hair-salon-portrait-2.jpg%3Fprefix%3Dtenants%252F6a4b7b2b63562d08f4c3747b%26v%3D1783339507297&w=1536&q=75&dpl=dpl_8qrUs23zSec9XHfPr5a7Amiqusem)![Blonde woman with layered haircut and long side-swept fringe in salon setting](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fblonde-layered-hair-salon-portrait-2.jpg%3Fprefix%3Dtenants%252F6a4b7b2b63562d08f4c3747b%26v%3D1783339507297&w=1536&q=75&dpl=dpl_8qrUs23zSec9XHfPr5a7Amiqusem) Colouring # Patch Test Complimentary 15 mins [Book Online](https://book.thesalon.app/salons/543801cc-449b-454c-8666-fe63b8864b7a/book?service=64f85966366e34e3767a5f1d) Patch testing is a diagnostic procedure that helps identify which everyday substances are triggering your allergic contact dermatitis or chronic skin reactions. Small doses of suspected allergens are applied to your upper back under adhesive patches, worn for 48 hours or longer, then read at intervals to see which sites develop localized eczema—giving you a clear picture of what to avoid. ## What the Test Involves Patch testing is **non-invasive and painless**, since allergens sit on the skin surface rather than being injected. You'll need **multiple visits over several days**: - **Application appointment**: patches containing selected allergens (metals like nickel, fragrances, preservatives, cosmetic ingredients, rubber chemicals) are placed on clean, healthy skin on your upper back - **First reading** (around 48 hours): patches are removed and each site is examined for redness, bumps or blisters - **Later reading** (72–96 hours, sometimes day 7): delayed reactions are checked, since contact allergy is a slow immune response During the wearing period you must **keep the back area dry**—no showers that soak the patches, swimming, saunas or vigorous exercise—and avoid applying any creams or perfumes over the test sites. ## Who Should Consider Patch Testing This test is designed for people with **chronic or recurring dermatitis** whose skin problems haven't responded well to standard treatment. It's especially useful if you suspect: - Reactions to jewellery, cosmetics, fragrances or hair products - Hand eczema linked to work exposures or household products - Facial dermatitis from skincare or makeup - Persistent rashes in areas that contact specific materials (clothing, shoes, rubber, adhesives) Patch testing identifies **delayed-type contact allergy**; if you have immediate reactions (hives within minutes, breathing problems, food anaphylaxis), different allergy tests are needed. ## After Your Results A positive reaction—localized redness, swelling or blisters directly under an allergen—indicates sensitization to that substance. Your specialist will: - Grade and interpret each reaction - Explain which everyday products and environments contain the offending allergen - Provide detailed **avoidance strategies** tailored to your lifestyle and occupation There are **no vaccines or cures for contact allergy**, so long-term management relies on strict avoidance. Most people see significant improvement or resolution of their dermatitis once identified allergens are eliminated from daily life. Mild temporary discomfort at positive sites is normal, but any intense reactions should be reported promptly so they can be managed appropriately. [Book Online](https://book.thesalon.app/salons/543801cc-449b-454c-8666-fe63b8864b7a/book?service=64f85966366e34e3767a5f1d) ## Frequently Asked Questions How long does patch testing take? The full process spans several days. Patches are applied at the first appointment, worn continuously for 48–72 hours, then removed for an initial reading. You'll return for at least one further reading at 72–96 hours, and sometimes a final check around day seven to catch delayed reactions. Is patch testing painful? No, the procedure is non-invasive and generally painless. Allergens sit on the skin surface under adhesive patches rather than being injected. Positive reactions may cause mild itching or discomfort at those sites, but this is temporary and manageable. What should I avoid during the test? Keep the patch area completely dry—no showers that soak your back, swimming, saunas or heavy sweating from vigorous exercise. Avoid applying any creams, perfumes or topical products over the patches, as these can interfere with results or dislodge the adhesive. What allergens are tested? Common panels include metals like nickel, fragrance mixes, preservatives, cosmetic ingredients, rubber chemicals and other frequent contact allergens found in everyday products. Your specialist will select the panel based on your history and suspected exposures. Can I shower during the test period? You can shower carefully, but you must keep the patch area on your upper back dry. Some clinics recommend sponge baths or washing below the waist only during the 48–72 hour wearing period to avoid loosening the adhesive or diluting the allergens. Will patch testing cure my dermatitis? Patch testing doesn't cure contact allergy—there are no vaccines for this type of reaction. Instead, it identifies which substances trigger your skin problems so you can avoid them. Most people see significant improvement once identified allergens are eliminated from daily life. How are results interpreted? Each patch site is examined for localized redness, swelling, bumps or blisters. Reactions are graded by intensity, and your specialist explains which substances you're sensitized to, where they're found in everyday products, and how to avoid them going forward. Who should have patch testing? It's designed for people with chronic or recurring contact dermatitis that hasn't responded well to standard treatment, especially if you suspect reactions to jewellery, cosmetics, fragrances, work exposures or household products. It identifies delayed-type allergy, not immediate reactions like hives or anaphylaxis. Do I need to stop any medications before testing? Some systemic medications that suppress immune responses may affect results. Disclose all current medications and topical treatments at your consultation so your specialist can advise whether timing needs adjustment for accurate testing. What happens if I have a strong reaction? Mild discomfort at positive sites is normal and expected. However, if you experience intense reactions, widespread flare of your underlying eczema, or severe itching, contact the clinic promptly so the specialist can assess and manage the response appropriately. 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