Patch Testing

If you have ongoing rashes, eczema, or irritation that doesn’t clear with standard treatment, patch testing can uncover whether a delayed skin allergy is the cause. At DermLab, we provide specialist patch testing under Dermatologist supervision to give clear answers about what’s affecting your skin.

What is patch testing?

Patch testing is the gold standard test for contact dermatitis — an allergic skin reaction that develops hours or days after contact with a substance. Unlike prick testing for food or pollen allergies, patch testing detects hidden triggers you encounter in daily life.

Substances we commonly test include:

• Metals such as nickel

• Fragrances and preservatives

• Hair dyes and cosmetics

• Rubber and adhesives

• Sunscreens

• Workplace or household chemicals

How the Test Works

Patch testing is carried out over a few days:

  • Day 1: Small patches containing allergens are applied to your back.

  • Day 3: Patches are removed and your skin is checked for reactions.

  • Day 5–7: A final reading is done to capture any delayed responses.

This stepwise approach ensures accurate results and helps guide your treatment.

Who Benefits from Patch Testing?

Patch testing is recommended for patients with:

• Chronic or recurrent eczema

• Rashes that don’t respond to usual treatment

• Reactions to jewellery, skincare, or cosmetics

• Unexplained dermatitis linked to work or hobbies

By identifying and avoiding the allergen, many patients experience significant improvement in their skin.

After the Test

If an allergy is found, your Dermatologist will explain how to avoid the trigger, provide a list of safe alternatives, and guide your next steps for skin management.

Frequently Asked Questions

  • No — the patches simply sit on your skin. You may feel some mild itch if a reaction develops, but the process is not painful.

  • We typically test for dozens of common substances. Your Dermatologist may add extra allergens based on your history.

  • You’ll need to keep the patches dry until they are removed. After that, you can shower as usual.

  • No. The patches don’t restrict normal activity, though you may need to avoid heavy sweating or sport while they are on.

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We know skin, and want you to be comfortable in yours. Let’s discuss your concerns and how to reclaim health and confidence.