Is It a Rash or Contact Dermatitis? Signs You Might Need Testing

If your skin suddenly breaks out in a red, itchy rash, the culprit may not be as simple as dry weather or irritation. Many people experience allergic contact dermatitis, a skin reaction caused by exposure to everyday substances that trigger the immune system. Recognizing the difference between a temporary rash and an allergy-related reaction can make all the difference in finding long-term relief.

At Chevy Chase Dermatology in Chevy Chase, MD, board-certified dermatologist Dr. Margaret Sommerville uses her extensive experience to identify and treat complex skin conditions. A graduate of the George Washington University Medical School, Dr. Sommerville provides diagnostic accuracy through personalized testing and evaluation. Her approach helps patients identify the root cause of their reactions and achieve healthy, comfortable skin.

Common Triggers Behind Allergic Contact Dermatitis

Allergic contact dermatitis happens when your immune system overreacts to an allergen. Even small amounts of exposure can cause significant symptoms. Some of the most frequent causes include:

• Fragrances and preservatives: Found in perfumes, soaps, and skincare products.
• Nickel and metals: Common in jewelry, belts, and clothing fasteners.
• Latex and rubber: Present in gloves, elastic, and everyday household items.
• Hair dyes and nail products: Contain chemicals that can irritate or sensitize skin.
• Plants: Poison ivy, oak, and sumac are well-known triggers of allergic reactions.

Pinpointing these irritants early can prevent flare-ups and help protect your skin’s barrier over time.

How Patch Testing Detects Allergens

When recurring rashes persist despite changing products or routines, patch testing can help identify the source. This non-invasive diagnostic test involves applying small patches containing potential allergens to the skin. Over several days, Dr. Sommerville monitors the area for visible reactions, determining which specific allergens cause inflammation.

Patch testing is especially useful for patients with chronic or unexplained dermatitis. Once triggers are identified, patients can adjust product use and habits to minimize future breakouts and discomfort.

Signs You May Need Allergic Contact Dermatitis Testing

If your rash repeatedly appears after exposure to certain materials or substances, it could indicate an allergic response. You may benefit from testing if you experience:

• Persistent itching or redness that appears after contact with personal care items or jewelry.
• Swelling or blisters on hands, face, or other frequently exposed areas.
• Recurring irritation that develops in the same spots after repeated exposure.
• Delayed reactions that occur hours or days after using a product.

These signs often signal that an allergen is involved, making patch testing a valuable diagnostic step.

Discover the Source of Your Rash

If a recurring rash has you guessing what’s behind it, expert testing can help uncover the cause. Contact Chevy Chase Dermatology in Chevy Chase, MD, for testing for allergic contact dermatitis with Dr. Margaret Sommerville. Call 301-656-7546 to schedule your evaluation and learn how patch testing can reveal what’s really irritating your skin.

Category: Medical Dermatology

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