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Patch testing is used to identify allergens that may be causing or contributing to dermatitis or contact dermatitis. Generally patch testing is used when a rash does not resolve with simple measures, persists despite treatment, flares unexpectedly, or involves a specific area that suggests contact dermatitis. Allergens are chemicals found in makeups, creams, topical medications, leather, clothing, shoes, work items, plants etc. that when in contact with the skin will cause rash or contact dermatitis for some individuals. A common example is nickel allergy. Nickel present in earrings and belt buckles can cause a chronic recurring rash on the belly or earlobe that will not resolve until nickel is avoided. Other common allergens that can cause dermatitis include fragrance, preservatives, rubber, leather, and botanicals. These agents can be more challenging to avoid.
There are two types of allergy testing: prick and patch. Prick testing is generally done by an allergist. It consists of pricking the skin and looking for a hive 20 minutes later. This type of testing is looking for allergens that cause or exacerbate hives, rhinitis or asthma symptoms when inhaled or ingested like cedar or peanuts. Patch testing is entirely different. Patch testing is looking at allergens that cause rash when in contact with the skin like nickel. Prick testing and Patch testing look at entirely different allergens.
Patch testing can be helpful for anyone with chronic dermatitis of unclear etiology. It is generally covered by insurance. Our office will confirm insurance coverage before scheduling your patch testing. When you visit the office the physician will consult with you about your dermatitis to determine if patch testing is appropriate. If patch testing is appropriate you will be scheduled on a Monday to have the patches placed on your back. At Dermatology San Antonio we use the North American Standard series to patch test which consists of a 70 of the most common allergens. The allergens are in vaseline or water and are placed on the back with stickers (patches). The patches remain in place for two days. You return on Wednesday to have the patches removed and to look for any reaction to the allergens. Lastly, you are seen two days later to read the test again. Rather than looking for hives in response to the allergen, we are looking for dermatitis. This can take days to develop, thus the Wednesday and Friday visit after the patches are placed on Monday.
If you test positive to any allergens you will be counseled about how to avoid them and where they are found. For some people avoidance can lead to resolution of their dermatitis. For other patients, their dermatitis may improve but not resolve. There is no allergen therapy or desensitization therapy like there is with prick testing. For allergens that cause contact dermatitis there is simply awareness and avoidance. There are some patients who will have a negative test and for some patients we identify allergens that are not contributing to their current dermatitis. Patch testing does not determine if your rash is due to a medication you are ingesting.
Examples of patients that have benefited from patch testing:
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