Contact dermatitis is a common skin condition that causes a red, itchy rash after your skin touches something irritating or allergenic. The word “dermatitis” means skin inflammation. “Contact” means the reaction happened after direct skin exposure.
Contact dermatitis can affect anyone and may appear suddenly or after repeated exposure. The rash can develop on any part of the body.
Contact dermatitis occurs when your skin reacts to a substance that irritates it or triggers an allergic response. Unlike eczema that may be caused by internal factors, contact dermatitis happens because something actually touches your skin.
The rash may develop within minutes or hours, or it may take one to two days to appear, depending on the type.
Symptoms may include:
On darker skin tones, redness may appear purple, gray or darker than surrounding skin.
The rash usually appears only where the skin came into contact with the substance.
There are three main types:
Irritant contact dermatitis is the most common type. It happens when a chemical or substance damages your skin’s protective barrier.
It often appears quickly after exposure and commonly affects the hands and face.
Frequent hand washing can increase risk because it weakens the skin barrier.
People who work in health care, food service, construction, cosmetology or childcare are at higher risk.
Allergic contact dermatitis occurs when your immune system reacts to a substance after exposure.
The reaction usually develops 24 to 48 hours after contact.
Unlike irritant dermatitis, allergic dermatitis may spread slightly beyond the contact area.
Some people sensitive to nickel may also react to foods high in nickel, such as certain nuts, beans and chocolate.
Photocontact dermatitis happens when a product on your skin reacts with sunlight.
For example:
The reaction only occurs when the treated skin is exposed to UV light.
Contact dermatitis is not contagious.
However, you can spread the irritant or allergen before washing it off. For example, touching poison ivy and then touching another person may transfer the plant oil.
You can also spread the substance to other parts of your own body.
If you avoid the trigger, mild cases often improve within a few days.
More severe reactions may last two to four weeks. Ongoing exposure can cause chronic or recurring rashes.
How is contact dermatitis diagnosed?
Your provider will:
If the cause is unclear, patch testing may be recommended. This test exposes your skin to small amounts of common allergens to identify triggers.
Rarely, your provider may perform a skin culture or biopsy.
Mild cases can often be treated at home.
Avoid direct sun exposure while healing.
See a provider if your rash:
You may need prescription-strength steroids or other treatment.
Complications are uncommon but may include:
Call 911 if you experience swelling of the lips or mouth, difficulty breathing or throat tightness.
If you have sensitive skin:
Prevention is the most effective long-term strategy.
Contact dermatitis can be uncomfortable, but identifying and avoiding triggers often brings quick relief. If your rash persists or worsens, schedule an appointment with a Banner Health provider for evaluation and treatment.
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