How to Identify Photosensitivity

Many people don't realize they're sensitive to the sun. They think sunblock, a hat, sunglasses and staying in the shade are enough. But ultraviolet rays, which cause tanning but can also cause burns and cancer, have long wavelengths and can get to skin even with precautions. Other circumstances can make your photosensitivity worse. Follow these steps to identify sensitivity to sunlight.

Instructions

1. Track your time in the sun. Notice especially any rashes that appear after you've been walking around town on a sunny day or sitting in the car a while in hot weather. Photosensitivity can surprise you at times you wouldn't expect.

2. Check your medications to see if any are known to cause photosensitivity. These include antihistamines, nonsteroidal anti-inflammatories such as Motrin and antibiotics like Bactrim.

3. Examine your arms for a pink or red rash. A cluster of raised spots measuring 2 to 5 mm in diameter each can mean polymorphous light eruption (PMLE) caused by photosensitivity. They may itch or cause a burning feeling.

4. Note how itchy your rash is. Red, inflamed bumps or patches that are impossible to keep from scratching can mean a sensitivity to the sun. These can also spread to areas that were covered, like the buttocks, but is most common on the face.

5. Notice if you get hives within 30 minutes of exposure to the sun. Solar urticaria isn't common but can be disturbing when it happens. Usually the parts of your body that are exposed to the sun, like your arms and legs, won't be affected but you might have them on your back and abdomen.

6. Watch your children for the appearance of fluid-filled blisters. These may occur in kids ages 3 to 15. They may burn, itch or sting a little and get black scabs. When they heal, they form scars.

7. Get tested for photosensitivity if any rashes that repeatedly appear after sun exposure. A hidden area on your body, such as on your back or buttocks, will be exposed to different types of ultraviolet light to see what your reaction is.

Tips & Warnings

• Photosensitivity caused by medications can look like a sunburn, contact rash or allergic reaction.

• HIV patients need to be extra careful in the sun.

• Hives caused by sun exposure should disappear once you get out of the sun.

• Don't assume you don't have to worry about photosensitivity just because you have dark skin.