Skin Allergy Patch Test London — Consultant Dermatologist‑Led

If you’re dealing with recurrent rashes, hand eczema from products at work, or facial irritation from cosmetics, patch testing can identify delayed skin allergies that standard blood or prick tests may miss. At Skinhorizon Clinic in Maida Vale (Central London), a consultant dermatologist leads your assessment for contact dermatitis and related reactions, using a curated allergen series and targeted extras based on your lifestyle and occupation.

What Is a Patch Test?

Patch testing checks for delayed hypersensitivity — allergic reactions that appear hours to days after contact. Small amounts of suspected allergens are placed on the back using hypoallergenic chambers and left for 48 hours. We then perform timed readings to see whether your skin reacts. Unlike food or pollen testing, patch tests are not for immediate reactions; they’re designed to pinpoint allergen triggers that worsen dermatitis and eczema.

Common Allergens We Screen

• Metals (nickel, cobalt, chromium)
• Fragrance mixes, balsam of Peru, essential oils
• Preservatives (MI/MCI, formaldehyde releasers, isothiazolinones)
• Rubber accelerators (thiurams, carbamates) — common in gloves & footwear
• Adhesives, acrylates (including gel nails and medical adhesives)
• Hair dye components (PPD), sunscreens, topical medications

Who Benefits from Patch Testing?

We recommend patch testing if you have hand dermatitis, facial or eyelid eczema, recurrent rashes under watches/jewellery, reactions to cosmetics or hair products, or if your skin flares with specific work materials. It’s useful for adults and teens; in younger children we select allergens carefully and prioritise comfort and practicality for families.

Your 3‑Visit Process

1. Visit 1 — Consultation & Application (Day 0): We take a detailed history, examine your skin and lifestyle exposures, and apply your customised panels. You’ll go home with patches secured and care instructions.
2. Visit 2 — First Reading (Day 2, ~48 hours): Patches are removed and early reactions are recorded.
3. Visit 3 — Final Reading & Plan (Day 4–5): Delayed reactions are assessed; you receive a written diagnosis, avoidance list and skincare plan.

Preparing for Your Patch Test

• Avoid topical steroids on the back for several days beforehand (we’ll advise exact timing).
• Oral steroids/immunosuppressants can blunt reactions — tell us all medications in advance.
• Keep the back dry while patches are in place — no showers, gyms or swimming.
• Wear loose clothing and avoid heavy sweating to prevent patch displacement.
• Bring a list or photos of your skincare, cosmetics, workplace products and gloves.

Results, Avoidance & Long‑Term Control

Test results are graded and interpreted in context — a weak reaction may still matter if it matches your exposure pattern. You’ll receive a personalised avoidance plan and safe product guidance. Where dermatitis is very active, we pair avoidance with a short stabilisation plan so your skin barrier can recover. If your hands are affected, we discuss glove materials and techniques; for eyelid or facial dermatitis, we review ingredients in cosmetics and sunscreens.

When to Investigate Further

Not all rashes are allergy‑driven. Irritant dermatitis, seborrhoeic dermatitis, and eczema can mimic allergic patterns. If needed, we consider adjunct tests such as a skin swab or targeted blood tests. Rarely, if a lesion or rash is atypical, we may discuss a skin biopsy to clarify the diagnosis and guide treatment.

Safety & Suitability

• Patch testing is generally safe; temporary redness or itch at test sites is common.
• We usually defer testing on very active or widespread dermatitis until calmer.
• Pregnancy/breastfeeding: testing can be considered if essential; many patients prefer to postpone — we’ll advise case‑by‑case.
• Children: we customise panels and use child‑friendly application and explanations.

Fees & What’s Included

Consultation: £250 — consultant review and skin examination.
Patch Test: £600 — application, two readings, final consultation and written avoidance plan.
Explore our diagnostics hub: Skin Allergy (Patch) Testing and learn more about contact dermatitis. Browse all skin conditions we treat.

Related: Dermatitis • Eczema • Dry Skin