Contact dermatitis

Your health care provider may be able to diagnose contact dermatitis by talking to you about your signs and symptoms. You might be asked questions to help identify the cause of your condition and uncover clues about the trigger substance. And you'll likely undergo a skin exam to assess the rash.

Your health care provider may suggest a patch test to identify the cause of your rash. In this test, small amounts of potential allergens are put on sticky patches. Then the patches are placed on your skin. They stay on your skin for 2 to 3 days. During this time, you'll need to keep your back dry. Then your health care provider checks for skin reactions under the patches and determines whether further testing is needed.

This test can be useful if the cause of your rash isn't apparent or if your rash recurs often. But the redness indicating a reaction can be hard to see on brown or Black skin, which may lead to a missed diagnosis.

If home care steps don't ease your signs and symptoms, your health care provider may prescribe medications. Examples include:

• Steroid creams or ointments. These are applied to the skin to help soothe the rash. You might apply prescription topical steroids, such as clobetasol 0.05% or triamcinolone 0.1%. Talk with your health care provider about how many times a day to apply it and for how many weeks.
• Pills. In severe cases, your health care provider may prescribe pills you take by mouth (oral medications) to reduce swelling, relieve itching or fight a bacterial infection.
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• Avoid the irritant or allergen. The key to this is identifying what's causing your rash and staying away from it. Your health care provider may give you a list of products that typically contain the substance that affects you. Also ask for a list of products that are free of the substance that affects you.

• Apply an anti-itch cream or ointment. Put on the itchy area 1% hydrocortisone cream or ointment (Cortizone 10, others). This is a nonprescription product that you can buy at a drugstore. Use it 1 to 2 times a day for a few days. Or try calamine lotion. Whatever product you use, try cooling it in the refrigerator before applying.
• Take an anti-itch drug. An oral antihistamine, such as diphenhydramine (Advil PM, Benadryl, others), which may also help you sleep better. A nonprescription antihistamine that won't make you so drowsy is loratadine (Alavert, Claritin, others).
• Apply cool, wet compresses. Place a cool, wet cloth over the rash for 15 to 30 minutes several times a day.
• Protect your skin. Avoid scratching. Trim your nails. If you can't keep from scratching an itchy area, cover it with a dressing. Leave blisters alone. While your skin heals, stay out of the sun or use other sun protection measures.
• Soak in a soothing cool bath. Soak the affected area in cool water for 20 minutes. Sprinkle the water an oatmeal-based bath product (Aveeno).
• Protect your hands. Rinse and dry hands well and gently after washing. Use moisturizers throughout the day — on top of any medicated cream you're using. And choose gloves based on what you're protecting your hands from. For example, plastic gloves lined with cotton are good if your hands are often wet.