Field treatments for actinic keratosis are very effective, however, they can be quite reactive so patients need to be aware of this.  For patients applying 5-Fluorouracil (Efudex) or Imiquimod (Aldara) the treatment cycle is usually 4 weeks.  There are variations in this, such as, 2 weeks on, 2 weeks off then 2 weeks on again.  Ingenol… Read more »