Patch testing is an in-office diagnostic procedure used to identify substances that may be causing allergic contact dermatitis, a common cause of persistent rashes and eczema. It can detect allergies to ingredients commonly found in skin-care products, cosmetics, medications, jewelry, clothing, adhesives and household products. Patch testing does not test for food allergies or seasonal allergies.

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Who should consider patch testing?

Patch testing may be appropriate for patients experiencing:

• Chronic or recurrent rashes

• Hand eczema

• Eyelid or facial dermatitis

• Eczema that is not improving with treatment

• A suspected reaction to a skin-care, hair-care or cosmetic product

• A rash related to workplace or occupational exposures

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Comprehensive 80-allergen testing

Lincoln Road Dermatology uses an expanded North American 80-allergen series to evaluate many of the most common and clinically relevant causes of allergic contact dermatitis.

The panel includes allergens found in:

• Fragrances and botanical ingredients

• Preservatives and antimicrobials

• Metals such as nickel, cobalt and chromium

• Topical medications and corticosteroids

• Hair dyes, cosmetics and skin-care products

• Rubber, adhesives, acrylates and resins

• Textile dyes and sunscreen ingredients

Additional allergens may be considered based on your rash, occupation and product exposures.

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What to expect

Patch testing takes three office visits over one week:

Wednesday: The patches are applied to your back.
Friday: The patches are removed and the skin is examined.
The following Tuesday: A final reading is performed, and your results are reviewed.

The patches must remain dry and securely in place during the testing period. Patch testing is not painful, although a positive reaction may temporarily cause itching or irritation.

After testing, you will receive personalized guidance about which ingredients to avoid and which products may be safer for your skin.

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How to prepare

For accurate results, please follow these steps before your first visit. If you are unsure about any of your medications, call us before stopping anything.

• Stop topical steroids, tacrolimus (Protopic) and pimecrolimus (Elidel) 1 week before testing.

• Avoid oral steroids such as prednisone (more than 10 mg a day) for 10 days before testing, or taper as your doctor directs.

• No steroid injections in the 3 weeks before testing.

• Avoid sun exposure, tanning and UV light therapy on your back for 2 weeks before testing.

• Arrive with a clean, rash-free back. Do not apply lotions, creams, oils or sunscreen to your back that day.

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Insurance and cost

Patch testing is considered a medical procedure, but insurance coverage varies by plan. Our team can review your benefits before scheduling. Self-pay options are also available.

Could an ingredient be contributing to your rash?

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Schedule a consultation to determine whether patch testing is appropriate for you.