Allergy Patch Test

Accuracy in patch testing significantly relies on keeping patches dry. Water or moisture can result in allergens dissolving, complicating results interpretation.

While patches and ink markings are on your skin during the 4 to 5-day testing window:

Do’s:

• Carefully shower or sponge bath, keeping patches/markings clear from water
• Shower on the morning before your patch test (you won’t be able to have a proper shower for approximately 96 hours after)
• Enjoy a break from exercise or sweat-inducing sport
• If a patch loosens, try to tape it down yourself
• Reach out to the clinic if you have questions or concerns

Don’ts:

• Wet patches or markings while bathing or showering
• Engage in intense exercise resulting in sweat
• Go swimming
• Wear light or valuable clothing (as the ink may stain)
• Expose yourself to sunlight
• Take immunosuppressive medications (these suppress test results)

• Reactions turning red, swelling or blistering
• Persistent reactions in strong positive allergies, which may last for a couple of weeks
• Eczema flare-ups due to positive patch test
• Pigmentation changes that can lighten or darken, often temporary

Patch testing might not be suitable for you if you:

• Are pregnant or breastfeeding
• Have extensive eczema on your back
• Have been exposed to the sun or used a sun bed over the previous two weeks
• Have recently applied an artificial tan
• Are using moderate or high dose oral steroids

Additional point, skin conditions like sunburn or rash or excessive hair growth on your back can hinder successful patch application. Remember to shave the area before your appointment if you have excessive back hair.
Antihistamines can lower visible reactions to allergens, so avoid them 48 hours before and during the patch testing period.