Allergy Testing

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Dermatology at Swift Access Health

Allergy Testing

Allergy testing allows us to identify specific substances — allergens — that are triggering immune reactions in the skin. The most clinically important form of dermatological allergy testing is patch testing, which is the definitive investigation for contact allergic dermatitis. It identifies precisely which chemicals, cosmetic ingredients, metals, or occupational substances are responsible for a patient’s skin reactions — enabling targeted, evidence-based avoidance strategies.

Patch testing is performed using a comprehensive standard allergen series supplemented by additional series relevant to the patient’s history. Results enable allergen avoidance and alternative product recommendations provided.

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Info

Time

Patch application: 30 minutes; two reading appointments at 48hr and 96hr

Results

Definitive identification of contact allergens, enabling targeted avoidance and treatment

Risks

Localised positive reactions at test sites (expected); rare systemic reaction; false positives/negatives possible

Recovery

Patch sites heal within 1–2 weeks following removal; avoid scratching positive sites

Anaesthetic

None required

Aftercare

Written allergen report; personalised product avoidance guidance; follow-up as needed

Why Choose Swift Access Health

Benefits of Expert Allergy Testing

Professional patch testing and expert interpretation by a consultant dermatologist provides definitive answers about your skin allergens — reducing diagnostic uncertainty and transforming how you manage your skin.

  • Comprehensive baseline patch test series covering the most clinically relevant allergens
  • Expert interpretation by a consultant dermatologist with experience in contact allergy diagnosis
  • Detailed written report identifying positive allergens and their common sources
  • Personalised product avoidance guidance — specific ingredients to avoid in skincare, cosmetics, and the environment
  • Clear linkage of test results to your clinical history and symptom pattern
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Your Patient Journey

1. Your
Consultation

Before patch testing proceeds, a full consultation with your dermatologist takes place to assess whether patch testing is appropriate for your presentation, to select the most relevant allergen series, and to review any medications that may need to be paused before testing (particularly oral steroids and immunosuppressants, which can suppress reactions).

Your Patient Journey

2. Your
Treatment

Allergen-containing chambers are applied to the upper back and left in place for 48 hours — during which the back must be kept dry. At the 48-hour appointment, the patches are removed and the skin is assessed. A further reading is performed at 96 hours (and occasionally 7 days) to detect delayed reactions. Results are interpreted in the context of your clinical history.

Your Patient Journey

3. Aftercare

Following the final reading, your dermatologist explains each result — distinguishing true positive allergic reactions from irritant reactions — and provides a written report identifying all relevant allergens. Personalised avoidance guidance is given, including specific ingredient names to avoid and safe alternative product recommendations. Follow-up is arranged to assess the impact of allergen avoidance on your skin.

Frequently Asked Questions

  • Patch testing is indicated for anyone with suspected contact allergic dermatitis — particularly if the rash is persistent, recurrent, occupationally related, or affecting the hands, face, or areas in contact with known allergen sources such as jewellery, hair dye, or cosmetics. It is also helpful for patients with eczema that is not responding to standard treatment.

  • Patch testing investigates delayed-type (Type IV) allergic reactions — the type responsible for contact dermatitis — and involves applying allergens to the skin under occlusion for 48 hours. Skin prick testing investigates immediate-type (Type I) IgE-mediated allergies such as those to pollen, pets, or foods, and produces a reaction within 15–20 minutes. The two tests investigate different immunological mechanisms.

  • Strong topical steroids and oral corticosteroids should be stopped before patch testing as they suppress the immune response and can cause false negative results. Your dermatologist will advise on exactly which treatments to pause and for how long, based on your specific regimen.

  • A negative patch test result can be informative — it suggests that Type IV contact allergy is not the primary driver of your skin problem. Your dermatologist will review the results in context and may suggest investigating other causes such as irritant contact dermatitis, endogenous eczema, or another diagnosis.

  • Patients who successfully avoid a confirmed allergen typically notice significant improvement in their skin within 4–8 weeks. Full clearance may take longer if the skin has been chronically inflamed. Your dermatologist will review your progress at follow-up and adjust any adjuvant treatment accordingly.

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