Contact Dermatitis
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Contact Dermatitis

En Español (Spanish Version)

Definition

Contact dermatitis is inflammation of the outer layers of the skin caused by contact with a particular substance. It usually presents as a rash that is typically confined to the specific area of the body where the contact occurred.

Contact Dermatitis

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Causes

Contact dermatitis is usually caused by either an irritant or an allergen. An irritant is a substance that irritates the skin. An allergen is a substance that causes an allergic reaction. People may be exposed to certain substances for years and never have a problem, and then suddenly develop contact dermatitis.

Some common causes of contact dermatitis include:

  • Acids
  • Alkalis
  • Solvents
  • Acetone
  • Soaps
  • Detergents
  • Metals, such as nickel (common in jewelry allergy)
  • Rubber
  • Latex
  • Cosmetics and toiletries
  • Deodorants
  • Preservatives
  • Plants, such as poison ivy
  • Medications

Risk Factors

A risk factor is something that increases your chance of getting a disease or condition.

  • Contact with an irritant or allergen
  • Allergies to certain substances, such as plants, chemicals, or medications

Symptoms

The symptoms of contact dermatitis may vary from person to person. Scratching and rubbing can cause or worsen some symptoms. The rash is usually confined to the area where the contact with the substance occurred, but occasionally may spread. If contact with the substance occurred all over the body, such as with a body lotion, the rash may be large.

Symptoms include:

  • Itching
  • Redness
  • Swelling
  • Blisters
  • Crusting, oozing, and scaling
  • Temporary thickening of the skin

Diagnosis

Your doctor will ask about your symptoms and medical history, and perform a physical exam. You may be referred to a doctor who specializes in skin disorders (dermatologist) or allergies (allergist).

Treatment

The primary goal of treatment is to identify the substance causing the reaction and remove or avoid it. This could take several days or weeks of avoiding certain substances.

If you cannot identify the cause of your skin reaction, you may need to undergo a skin patch test. In a patch test, a small amount of the suspected substance is applied to the skin and covered with tape. Another patch without the substance on it is also attached to the skin. Both patches are removed after a period of time. If your skin is red and swollen under the suspect patch, and not under the other patch, you are probably allergic to that substance.

Treatment also focuses on caring for skin and relieving symptoms. Methods include:

Skin Care

  • Wash the area with water and mild soap or cleanser and gently pat dry.
  • Apply a barrier ointment such as petrolatum or vaseline.
  • Do not poke at or cut open blisters. They can become infected.
  • Cover blisters with dry bandages.

Medications

Do not use any of these medications until after you have discussed them with your doctor.

  • Over-the-counter or prescription creams and ointments containing cortisone
  • Prescription medications containing corticosteroids, such as prednisone (for severe cases)
  • Prescription or over-the-counter antihistamines (may relieve itching in some cases, but not always useful for contact dermatitis)
  • Phototherapy or immunosuppressants, such as menthotrexate or cyclosporine, in the most severe, resistant, and chronic cases

Prevention

The best way to prevent contact dermatitis is to identify the substances that give you the condition and avoid them.

RESOURCES:

American Academy of Dermatology
http://www.aad.org

American Academy of Allergy, Asthma, and Immunology
http://www.aaaai.org

CANADIAN RESOURCES:

BC Health Guide
http://www.bchealthguide.org/

Canadian Dermatology Association
http://www.dermatology.ca/english/

References:

American Academy of Allergy, Asthma, and Immunology website. Available at: http://www.aaaai.org . Accessed on October 11, 2005.

American Academy of Dermatology website. Available at: http://www.aad.org . Accessed on October 11, 2005.

Bourke J, Coulson I, English J. Guidelines for care of contact dermatitis. Br J Dermatol . 2001;145:877-885.

National Institute of Arthritis and Musculoskeletal and Skin Diseases website. Available at: http://www.niams.nih.gov/ . Accessed on October 11, 2005.



Last reviewed October 2007 by Ross Zeltser, MD

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.


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