Patch testing
Patch testing is a diagnostic method used to identify specific substances causing allergic contact dermatitis, a skin condition caused by an immune reaction to specific allergens.
Common allergens might exist in metals (like nickel), fragrances, preservatives, rubber, and hairdye. However, there are hundreds of potential causes for allergic contact dermatitis whichmakes it difficult to diagnose.
During the test, allergens are individually loaded onto patches, which are then placed on theskin with adhesive tape. After 48 hours, the patches are removed, and the skin is assessed forany reactions. A follow-up examination is conducted after another 48 hours.
Day 1: Patches applied to your back
Day 3: Patches removed; initial results read.
Day 5: Final reading for reactions.
During this time, you should avoid showering or scratching the test area. In addition, try to avoid excessive sweating as that can impact the results.
Yes, patch testing can be performed on children, especially when allergic contact dermatitis issuspected. However, the range of allergens tested may be adjusted based on the child's ageand medical history.
Patch testing is generally safe. However, you may experience:
Itching or discomfort at test sites
Redness, swelling, or small blisters as a positive reaction to the test
Rarely, skin discolouration
These side effects usually resolve within a few days and are a normal part of identifying allergictriggers
You may benefit from patch testing if:
You have recurrent rashes that commonly occur on the hands, feet, neck and face(eyelids).
You are concerned about occupational exposure that may be causing your rashes.
Your symptoms worsen after using skincare, hair dye, jewellery, cleaning products etc.
Once the allergen(s) causing your allergic contact dermatitis are identified:
You'll receive a list of ingredients or substances to avoid
Your doctor may recommend changes to personal care products or occupation-related
A customised management plan will be created
This helps prevent future flare-ups and improves long-term skin health.
If you're dealing with persistent skin irritation, rashes, or suspected allergic reactions, consider speaking with Dr Jason Yu about patch testing. Conveniently located next to Redfern Station and easily accessible from Waterloo, Alexandria, Zetland, Erskineville, and Marrickville, identifying the cause of your skin sensitivities is just a step away.
