What is contact dermatitis?

Contact dermatitis is a type of rash that develops after touching something that irritates your skin or that you are allergic to. The skin often appears red or swollen and may burn or feel itchy. The rash may blister. Some rashes form right away while others can take a few days or weeks to appear. 

Two forms of contact dermatitis include irritant contact dermatitis and allergic contact dermatitis. When the rash is caused by a substance that irritates the skin, it is called irritant contact dermatitis. If the rash is the result of coming in contact with a substance that causes you to have an allergic reaction, it is called allergic contact dermatitis.

Contact dermatitis symptoms vary and can depend on whether it is caused by an allergic reaction or an irritant. Symptoms can also change over time. In most cases, symptoms only affect the area of your skin that had contact with the substance. However, the rash can develop on other parts of your body if you touch those areas while the triggering substance is on your hands. 

Reactions usually happen after repeated exposure to the irritant or allergen. However, stronger irritants can produce symptoms after initial contact. Sometimes, it is possible to tolerate a substance for years before developing contact dermatitis. People with fair skin, dry skin or other skin conditions may be more likely to have contact dermatitis.

Irritant contact dermatitis happens when the skin comes into contact with an irritant. The most common irritants are products that people use on a daily basis. These can include soap, shampoos, detergents and rubbing alcohol. You may also have an increased risk if you work in the healthcare, food service or another industry that requires you to wash your hands often.

Symptoms of irritant contact dermatitis include:

• Mild irritants, which can cause itching, redness, dryness and small cracks in the skin.
• Stronger irritants, which can lead to tenderness, swelling, blisters and oozing. This type of dermatitis often affects the hands, especially between the fingers. It can also occur on the face, commonly on the eyelids. 

Allergens are substances that cause an allergic reaction. In allergic contact dermatitis, exposure to the allergen triggers an immune reaction in your skin, often causing itching and redness. Examples of allergens include plants like poison ivy, cosmetics, latex and nickel in jewelry, buttons or keys. A few airborne allergens, such as ragweed pollen and insecticide sprays, can also cause allergic contact dermatitis. 

Common symptoms of allergic contact dermatitis include:

• Intense itching.
• Red, streaky or patchy rash with bumps or blisters that may ooze or drain and feel warm and tender. The rash typically appears within 1–2 days after you have contact with the allergen, but some may take more time.  

If you have symptoms of contact dermatitis, see your healthcare provider. They’ll check your skin and ask you questions about what substances you’ve had contact with. It’s helpful to bring a list of everything you’ve been exposed to or touched and everywhere you’ve been over the past couple of days. 

In severe cases, your provider may do patch testing. This involves applying small patches of potential allergens and irritants to your skin. After about two days, the patches are removed. Your provider will then check the areas for signs of a reaction. Then they’ll likely check your skin again after another few days to look for a delayed reaction. You may also have other types of testing done after that.

Treatment for contact dermatitis includes healing the irritated skin and avoiding the irritant or allergen so you don’t have future reactions. You also shouldn’t scratch your skin. Your healthcare provider will recommend treatment based on what’s causing the reaction and the severity of your symptoms. You’ll also have to throw out irritants or allergens, and you may need to wash clothes and other materials that have been exposed to the irritant or allergen.

In irritant contact dermatitis, treatment often involves washing the affected area well to remove traces of the irritant from your skin. Your provider may also suggest a moisturizer or emollient. Moisturizing can help your skin repair and protect itself from further inflammation.

In allergic contact dermatitis, your provider may recommend an itching and rash treatment with an oatmeal bath or soothing lotion, such as calamine lotion. In some cases, your provider may tell you to apply a wet or damp dressing, especially if the affected area is oozing fluid or crusting. This can help protect the area, ease itching, reduce redness and remove crusting.

Medications can also help contact dermatitis. Examples include antihistamines to help relieve itching and steroid creams or ointments to help reduce skin inflammation. You may need antibiotics if the skin becomes infected. 

Contact dermatitis often clears up within two to four weeks. However, your symptoms can come back if you’re exposed to the irritant or allergen again. If you have contact with a known irritant or allergen, wash the affected skin with soap and water right away.

No, contact dermatitis isn’t contagious. You develop from the issue after coming into contact with an irritant or allergen.

Updated April 2025.