PDT is applied to the entire field of sun damage, thereby destroying actinic keratosis that are both visible and microscopic. 2. The exact areas to be treated are applied by the physician to ensure the accuracy of the treatment. 3. Scientific studies have shown that people who have undergone PDT have improved skin texture and tone, as well as an improvement in their overall appearance. 4. In addition, the reaction that develops from PDT often subsides within two weeks whereas the reaction from Fluorouracil or Imiquimod may last longer than four to six weeks. 5. You will not need to fill a prescription. 6. No scarring from PDT has been reported to date. 7. Finally, most Medicare plans cover the cost of PDT through a medical benefit.