Prophylactic Photodynamic Therapy to Organ Transplant Patients

Inclusion Criteria: * Organ transplant recipients. * Age 40 years or older. Exclusion Criteria: * Patients younger than 40 years and older than 70 years. * Clinical signs of skin cancer, actinic keratoses or warts at the time of inclusion. * Previous photodynamic therapy to the skin areas investigated. * Pregnancy or breast feeding patients. * Patients with porphyria. * Patients with a tendency to produce hypertrophic scars or keloids. * Patients with known allergy to Metvix. * Patients who are not considered able to follow the treatment protocol (e.g. severely alcoholic patients, dementia patients, mentally ill patients etc.).