We humans have a whole lotta skin: The average adult human body has about 22 square feet of it. If you could step out of your skin and plop it on a scale (kids, don’t try this at home), it would weigh 8 pounds. And every minute, 40,000 of your dead skin cells flake off your body and join their brethren among the dust that accumulates in your home. Knowing how much dead skin we slough off, some scientists decided to test what that skin is up to, discovering that the oils in dead skin cells actually help reduce indoor air pollution. (more…)

Hospitals may start packing heat in the near future, but patients–especially burn victims–will be rejoicing. The “skin gun” fires stem cells instead of bullets, and it can heal second-degree burns faster than we’ve ever done it before.

Usually, skin grafting is an arduous process: It takes weeks to grow a fragile patch of skin over a wound. But with the skin gun, the grafting process takes 90 minutes and patients heal up within four days. And in the world of skin grafting, that speedy timeline is precious because it means that infections have less of a chance of setting in and killing patients.

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The standard inkjet printer found in offices around the world is the inspiration for a new medical device that can help patients with severe burns. Researchers at Wake Forest University rigged up a device that can spray skin cells directly onto a burn victim’s wounds, and animal trials showed that the treatment healed wounds quickly and safely. The team says this printing method could be an improvement over traditional skin grafts, which often leave serious scars.

The researchers explain that the device is mounted in a frame that can be wheeled over a patient in a hospital bed. A laser then takes a reading of the wound’s size and shape so that a layer of healing cells can be precisely applied, Reuters reports.

“We literally print the cells directly onto the wound,” said student Kyle Binder, who helped design the device. “We can put specific cells where they need to go.”

In the trials, this treatment completely closed wounds in just two weeks. The “bioprinting” device has so far only been tested on mice, but the team will soon try out the technique on pigs, whose skin is similar to that of humans. Eventually, the team expects to request FDA approval for human trials.

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If you’re tired of squinting into your tiny iPod or phone screen, then how about switching to a whole new system that uses your skin’s surface as a screen? Enter “Skinput,” a new prototype that allows you to use your skin as both a touchscreen and an input device.

Researchers from Carnegie Mellon University and Microsoft’s Redmond lab found that jabbing at body parts like the forearm created acoustic waves that could be detected higher up in the arm by a bunch of sensors strapped onto an armband. As bone densities and the amount of soft tissue varies at different locations in the body, the vibrations produced by the jabbing motion were different at various locations. So, if you press a bunch of “buttons” being projected on your skin by a tiny projector on the armband, the device can track your inputs precisely.

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It appears body art has hit a whole new level: A woman with a rare skin condition known as dermatographia has been using a blunt knitting needle to etch designs into her skin—and selling them for up to $4,500.

As a symptom of her condition, Ariana Page Russell’s skin swells up into welts at the slightest scratch. Dermatographia, which affects only five percent of the population, is apparently caused by the release of histamines by mast cells near the surface of the skin, once any pressure is applied. Within five minutes, the skin swells in a reaction similar to hives—but it doesn’t hurt, it just “feels a little warm.”

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Prone to sunburn? Help may be on the way. Scotland researchers have developed a wristband that warns its users when they’re about to get burned. The indicator changes color when exposed to potentially dangerous levels of UV rays, so as soon as it turns pink, a person knows to get out of the sun. Or not, and burn.

The technology, which chief researcher Andrew Mills calls “intelligent ink,” relies on a simple enough process: UV rays trigger a chemical reaction in the indicator, which contains an acid-sensitive dye that then causes the change in color. The band improves upon other UV-measuring devices because it gives a signal at the precise moment the sun is about to cause damage. It can also be adapted to different skin types/colors by adding alkali, which delays when the dye changes color.

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