Aminolevulinic acid (ALA or Levulan) is a drug that's applied to the skin. It’s used to treat actinic keratosis (AK), a skin condition that can become cancer, and is used only on the face or scalp. A special blue light, rather than laser light, is used to activate this drug.
PDT is an in-office procedure. This means that you can get the procedure done without having to be admitted into a hospital or stay in the doctor’s office after treatment for too long. This also means that you’ll stay awake during the procedure.