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The new treatment, which is being rolled out to hospitals across the UK, would see skin cancer patients given a drug which makes the affected skin sensitive to light. The disposable light-emitting plaster is then stuck over the top, allowing photodynamic therapy treatment (PDT) to be applied directly to the skin, destroying the cancerous cells. For non-melanoma, the most common treatment in the past has involved applying a cream to the skin for several hours before the patient undergoes intensive light treatment.