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Contact allergy

Professionally updated: March 9, 2026

Contact allergy is a type of allergic reaction that occurs when the skin comes into contact with certain substances. Symptoms can range from mild irritation and redness to itching, blisters, and eczema.

At Lægerne Danmark, our dermatologists will guide you in identifying the cause, preventing new reactions, and treating existing symptoms.

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Jakob Fraes
Specialist in General Medicine, Ph.D.
Read more about Contact Allergy. Everything you need to know.

What is contact allergy?

Contact allergy occurs when the immune system reacts to substances that are not normally harmful. Common allergens include nickel, perfume, preservatives, cosmetics, or certain chemicals in skin care products.

The reaction may manifest as:

  • Redness and itching
  • Rash or blisters
  • Swelling or thickened skin
  • Eczema-like changes

It is important to understand that symptoms do not always appear immediately; some may develop over hours or days after contact with the allergen.

Causes and risk factors

Contact allergies can affect anyone, but certain factors increase the risk:

  • Repeated contact with irritants or allergens
  • Previous allergic reactions
  • Skin condition, e.g., dry or damaged skin

Identifying the exact allergen is key to preventing repeated outbreaks and reducing symptoms.

Consultation with a dermatologist

Managing contact allergies often requires an individual assessment. During your consultation with our dermatologist, you can:

  • Get tested to find out which substances you are allergic to (e.g., patch test)
  • Discuss symptoms, medications, and previous skin problems
  • Get guidance on prevention and proper treatment

A thorough consultation ensures that you get answers to all your questions and can take concrete steps to avoid allergens and alleviate existing skin reactions.

Treatment and prevention

Treatment depends on the allergen and symptoms:

Prevention:

  • Identify and avoid contact with the allergen
  • Wear protective clothing or gloves
  • Choose hypoallergenic skin care products

Medical treatment:

  • Corticosteroid creams to reduce inflammation
  • Moisturizing and protective ointments
  • Possibly systemic medication in more severe cases

Advantages of choosing a private dermatologist

At Lægerne Danmark, you get quick access to a specialized dermatologist without long waiting times. You will receive an individual and thorough assessment of your symptoms as well as professional guidance on the prevention and treatment of contact allergies.

Our dermatologists follow current professional guidelines and have extensive experience in diagnosing, testing, and treating allergic skin reactions.

Side effects and risks

Treatment for contact allergies is generally safe, but some medications can have side effects, such as skin thinning with prolonged use of strong corticosteroids. Your dermatologist will assess the risks and tailor the treatment to your needs.

A personal assessment

The treatment of contact allergies is individual. Symptoms, allergens, and treatment options vary from person to person. At Lægerne Danmark, you will receive a professional and caring assessment, with time to discuss symptoms, concerns, and prevention.

Book now

Book an appointment with our dermatologist today, either in person or via video consultation, and receive personalized guidance and follow-up so you can prevent and treat contact allergies in the most effective way.

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Frequently asked questions about contact allergy

What is contact allergy?

Contact allergy is an allergic reaction in the skin that occurs when the immune system reacts to substances that the body normally tolerates. Typical symptoms include redness, itching, rash, or eczema.

Which substances can cause contact allergies?

Common allergens include nickel, perfume, preservatives, cosmetics, and chemicals in skin care products or work clothes.

How do I know if I have contact allergy?

A dermatologist can test for contact allergies, typically with a patch test. The test helps identify the substances that trigger the symptoms.

Can contact allergies be prevented?

Yes, identifying and avoiding allergens can prevent new reactions. Using allergy-friendly products and protecting the skin with gloves or clothing can also help.

When should I contact a dermatologist?

Contact a dermatologist if you experience persistent or recurring rashes, severe itching, blisters, or other skin reactions that do not go away with regular skin care.

Is contact allergy dangerous?

Contact allergy is rarely dangerous, but it can be bothersome and affect quality of life. Early diagnosis and proper treatment can prevent worsening symptoms and discomfort.