Contact Dermatitis

Contact Dermatitis occurs when the skin reacts to a substance which it has been in contact with resulting in a red, itchy rash. The rash typically occurs in the same distribution as the area of contact. While the condition is not contagious, it can significantly impact comfort, sleep, and productivity if left unmanaged.

Contact dermatitis is found more commonly in women than men, primarily due to nickel found in some jewellery and to acrylate allergy associated with nail cosmetics. Contact dermatitis is particularly prevalent in metal workers, cleaners, painters, hairdressers and health care workers.

What is Contact Dermatitis?

Contact dermatitis occurs when a substance you come into physical contact your skin and causes either direct damage to your skin's protective surface or triggers an inflammatory immune response.

There are two primary types of this condition:

Allergic Contact Dermatitis: This occurs when your immune system reacts to a specific substance (allergen) after becoming allergically sensitised to it. The resulting allergic rash typically develops 24 to 48 hours after the exposure.
Irritant Contact Dermatitis: This is the most common form. It is caused by direct chemical or physical damage to the skin's outer protective barrier. This can happen after a single exposure to a strong substance or repeated contact with milder irritants.

Common Triggers and Exposures

Triggers are widely present in both domestic environments and workplaces.

Common Skin Allergens

Metals: Nickel is a frequent culprit which is often found in jewelry, watches, zips and jeans studs, and coins.
Fragrances: Present in perfumes, cosmetics, soaps, and scented lotions.
Preservatives: Chemicals commonly found in wet wipes, liquid soaps, and skin products.
Adhesives & Latex: Found in bandages, medical tapes, protective gloves and certain footwear.

Common Skin Irritants

Soaps and Detergents: Frequent use can compromise the skin barrier by stripping the skin of its protective lipids.
Frequent Wet Work: Persistently having wet hands and frequent hand washing leaves the skin more vulnerable. This can be unavoidable in healthcare, hairdressing, and catering industries.
Chemicals: Cleaning solvents, bleach, rubbing alcohol, and industrial fluids.

Symptoms of Contact Dermatitis

Contact dermatitis symptoms generally flare up on the specific area of skin that touched the triggering substance. Typical symptoms include:

Intense itching, burning, or stinging sensation.
Red, inflamed, or swollen skin.
Dry, cracked, leathery, or scaly patches.
Small blisters that may ooze fluid and form crusts.

Diagnosis of Contact Dermatitis

Identifying the root cause of a skin reaction is important for recovery. For both children and adults, medical professionals use specialized Patch Testing to accurately pinpoint specific allergic triggers.

How is Patch Testing carried out

Application (Day 1): Small, safe amounts of potential allergens are applied to the back using specialised hypoallergenic chambers.
First Reading (Day 3): The patches are removed by one of our doctors to check for early localised skin reactions.
Final Reading (Day 5): Our doctors review the test area again to check for delayed reactions and a medical treatment plan is put in place.

Medical Treatment and Long-Term Management

Once the specific culprits or irritants are identified, clinical management focuses on healing the skin and preventing future flare-ups:

Strict Trigger Avoidance: Patients receive precise guidance on how to identify and avoid their specific allergens in household items and workplace materials.
Emollient Therapy: Regular use of medical-grade moisturisers helps repair the damaged skin barrier and reinforce it against irritant penetration.
Topical Medical Treatments: Short courses of prescription corticosteroid creams or ointments are frequently used to quickly calm active inflammation, resolve itching and restore the skin barrier to being intact again.

Contact Us to Schedule Your Consultation

If you are struggling with an undiagnosed, persistent rash, a clinical evaluation can provide clarity. Allergy Ireland provides comprehensive allergy consultations and allergy testing for both adult and children at our Dublin clinic.