Have you ever used a new skincare product only to experience unexplained itching, redness, or irritation that won’t go away? Many people develop allergic reactions to everyday items like cosmetics, detergents, and even jewelry without realizing what’s causing them. Allergy Patch Testing is a medical procedure that can uncover the hidden triggers behind these frustrating skin reactions, helping you finally find relief and protect your skin’s health.
At Skin and Beauty Center, Los Angeles’s most comprehensive skincare destination, our expert dermatologists specialize in identifying and treating allergic skin conditions with precision and care. Trust our team to provide personalized, science-backed solutions that help you restore comfort and confidence in your skin.
Signs of Allergic Contact Dermatitis
Common signs and symptoms include:
- Redness and Inflammation:Â The affected skin often appears red, swollen, or warm to the touch.
- Itching and Burning:Â Persistent itching or a burning sensation are hallmark signs of an allergic response.
- Rash or Bumps:Â You may notice small raised bumps, blisters, or dry, scaly patches that resemble eczema.
- Oozing or Crusting:Â Severe reactions can lead to fluid-filled blisters that ooze or crust as they heal.
- Localized Reaction:Â Symptoms usually appear where your skin came into contact with the allergen, such as your hands, face, neck, or wrists.
WHAT IS PATCH TESTING?
Patch testing is a convenient and predictable method of diagnosing allergic contact dermatitis. It involves applying patches to a person’s back or neck. Each patch contains a suspected irritant (allergen) in a small disc or chamber. The chemical or substance on the patch is detected by the skin’s immune system. The skin either reacts with irritation, a positive result, or does not.
HOW DO I PREPARE FOR A PATCH TEST?
- Preparation for a patch test begins two weeks before your appointment. At that time, we request that you avoid sun exposure.
- Starting one week before your appointment, you should avoid using topical medicines on your back or other areas on which patches may be placed. If you are unsure about potential patch locations, contact our office. Products may continue to be used in areas of the body which will not be patched.
- You may use skin moisturizers until the day before your appointment.
HOW DOES PATCH TESTING WORK?
Patches are applied to the back or other convenient area, where they must remain for 2 days. The pads or panels must not be removed during this time. After 2 days, panels are removed in the office, where the doctor observes the skin and takes note of signs of an allergic reaction. After another 2 to 5 days, a second examination is done. This helps to identify which reactions are irritant and which are allergic if any. Signs of an allergic reaction include redness, tiny blisters, or a small rash with swelling.
CAN YOU SHOWER AFTER A PATCH TEST?
It is important NOT to get the panels or surrounding skin wet. During the time when patches are on the skin, it is best to sponge-bathe. After the patches have been removed, it is still important NOT to get the area wet. You may shower but only if you can avoid water reaching the back or other skin where patches had been applied.
In addition to avoiding showers during the patch test process, you should avoid exercise or other activities that may cause you to sweat. If a panel becomes loose, the hypoallergenic tape may be placed around the edges to reattach it.
WHAT DOES A POSITIVE PATCH TEST LOOK LIKE?
The skin’s immune system recognizes irritants and allergens relatively quickly, which is why the first reading occurs after just 2 days of wear. However, it can take up to 10 days for a full response to be evident. A positive allergen may look like a small rash with red, raised skin. Tiny blisters may also be visible.
If your patch test reveals allergens, your doctor will discuss the substance or substances that are involved, including where you may come into contact with them in your day-to-day life. They may have information regarding the types of products that may contain the substances causing your allergic reaction, assisting you in beginning to develop a list of alternatives or strategies for avoidance.
IS PATCH TESTING UNCOMFORTABLE?
No. Patch testing contains precise amounts of suspected irritants and allergens. This minimizes the risk of a strong, uncomfortable allergic reaction. The skin’s response to patch testing is typically only strong enough to help your doctor discern between irritation and allergic contact dermatitis.
WHAT ARE THE SIDE EFFECTS OF PATCH TESTING?
The most common side effects reported are mild burning and itching sensations. It is important to avoid scratching the test area. This could exacerbate the irritation and may also affect the doctor’s ability to accurately read your skin’s response. Rarely do itching and burning become severe. If this happens, contact the doctor immediately.
WHAT CHEMICALS ARE TESTED IN A PATCH TEST?
Patch tests may include a wide variety of different suspected allergens. Examples include topical medications, cosmetics, hair dye, and other substances that a patient may come into contact with.
Sometimes, patients provide their own sample of one or more suspected irritants. Generally, doctors use the North American Contact Dermatitis Group (NACDG) Standard Screening Tray, which includes approximately 80 different chemicals. These range from a fragrance mix to Bacitracin. Before your test, your doctor will discuss the specific types of substances that are included in your process.
Why Choose Skin & Beauty Center
At Skin & Beauty Center, we combine medical expertise with a personalized, patient-first approach to deliver exceptional skin care. Our team of board-certified dermatologists specialize in diagnosing and treating complex skin conditions, including allergic contact dermatitis, using the latest testing methods and evidence-based treatments. Every patient receives individualized care designed to uncover the root cause of their skin conditions to restore lasting comfort.
With multiple locations across Southern California, Skin & Beauty Center is recognized as one of the region’s most comprehensive dermatology practices. From advanced allergy patch testing to full-spectrum medical, surgical, and cosmetic dermatology services, our team is committed to helping you achieve healthy, radiant skin in a supportive and professional environment.
Frequently Asked Questions
Can patch testing be done on children?
Yes, patch testing can be performed on children if they are suspected of having allergic contact dermatitis. The process is similar to that used for adults but may involve a smaller selection of allergens and careful monitoring for comfort and safety.
Can I be tested if I have a rash or skin irritation?
If the test area is actively inflamed, patch testing may need to be postponed. Testing on irritated skin can compromise accuracy or cause unnecessary discomfort.
What happens if I have a severe reaction to one of the allergens?
If you experience a strong reaction, your dermatologist will remove the patch and treat the area with topical medication or a soothing ointment. Severe reactions are rare, but your provider will monitor your skin closely to ensure proper healing.
What happens if I test positive for an allergen?
Testing positive means your skin reacted to a specific substance, confirming an allergy. Your dermatologist will help you identify where that allergen may be found and recommend safe alternatives to prevent future flare-ups.
Can allergic contact dermatitis be cured?
While allergic contact dermatitis can’t be permanently cured, it can be effectively managed. Once your allergens are identified, avoiding them and following your dermatologist’s care plan can help keep your skin clear and healthy.
SCHEDULE A CONSULTATION
The Skin and Beauty Center proudly serves areas in and around Glendale, Burbank, Pasadena, Northridge, Santa Clarita, and West Hills. Contact an office near you to learn more about patch testing for allergic contact dermatitis.
