The high-tech device contains a small light that combines with a chemical cream to kill skin cancer cells.

The Ambulight plaster has already been used on 50 patients with a success rate of up to 90 percent. It is suppose to be less painful than surgery and leaves no scar.

The treatment is called photodynamic therapy. Photodynamic therapy (PDT) is a treatment that uses a drug, called a photosensitizer or photosensitizing agent, and a particular type of light. When photosensitizers are exposed to a specific wavelength of light, they produce a form of oxygen that kills nearby cells.

In addition to directly killing cancer cells, PDT appears to shrink or destroy tumors in two other ways. The photosensitizer can damage blood vessels in the tumor, thereby preventing the cancer from receiving necessary nutrients.