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No laps for warm laptops; skin damage is possible

By LINDSEY TANNER, AP Medical Writer Lindsey Tanner, Ap Medical Writer Mon

Oct 4, 12:57 am ET

CHICAGO Have you ever worked on your laptop computer with it sitting on your

lap, heating up your legs? If so, you might want to rethink that habit.

Doing it a lot can lead to "toasted skin syndrome," an unusual-looking mottled

skin condition caused by long-term heat exposure, according to medical reports.

In one recent case, a 12-year-old boy developed a sponge-patterned skin

discoloration on his left thigh after playing computer games a few hours every

day for several months.

"He recognized that the laptop got hot on the left side; however, regardless of

that, he did not change its position," Swiss researchers reported in an article

published Monday in the journal Pediatrics.

Another case involved a Virginia law student who sought treatment for the

mottled discoloration on her leg.

Dr. Kimberley Salkey, who treated the young woman, was stumped until she

learned the student spent about six hours a day working with her computer

propped on her lap. The temperature underneath registered 125 degrees.

That case, from 2007, is one of 10 laptop-related cases reported in medical

journals in the past six years.

The condition also can be caused by overuse of heating pads and other heat

sources that usually aren't hot enough to cause burns. It's generally harmless

but can cause permanent skin darkening. In very rare cases, it can cause damage

leading to skin cancers, said the Swiss researchers, Drs. Andreas Arnold and

Peter Itin from University Hospital Basel. They do not cite any skin cancer

cases linked to laptop use, but suggest, to be safe, placing a carrying case or

other heat shield under the laptop if you have to hold it in your lap.

Salkey, an assistant dermatology professor at Eastern Virginia Medical School,

said that under the microscope, the affected skin resembles skin damaged by

long-term sun exposure.

Major manufacturers including Apple, Hewlett Packard and Dell warn in user

manuals against placing laptops on laps or exposed skin for extended periods of

time because of the risk for burns.

A medical report several years ago found that men who used laptops on their

laps had elevated scrotum temperatures. If prolonged, that kind of heat can

decrease sperm production, which can potentially lead to infertility. Whether

laptop use itself can cause that kind of harm hasn't been confirmed.

In the past, "toasted skin syndrome" has occurred in workers whose jobs require

being close to a heat source, including bakers and glass blowers, and, before

central heating, in people who huddled near potbellied stoves to stay warm.

Dr. Anthony J. Mancini, dermatology chief at Children's Memorial Hospital in

Chicago, said he'd treated a boy who developed the condition from using a

heating pad "hours at a time" to soothe a thigh injured in soccer. Mancini said

he'd also seen a case caused by a hot water bottle.

He noted that chronic, prolonged skin inflammation can potentially increase

chances for squamous cell skin cancer, which is more aggressive than the most

common skin cancer. But Mancini said it's unlikely computer use would lead to

cancer since it's so easy to avoid prolonged close skin contact with laptops.