I have used Carac several times and am on day 13 for neck and chest. It has been unbearable but I continue. Yesterday, I went to the dr. (my dr. was out) and the Dr. I saw said I should discontinue Carac - wait a few weeks and schedule Photodynamic Therapy - blue light treatment. He says one week before this Photodynamic Therapy I would apply Carac then come in for the PDT. I am not sure if after 13 days of Carac that to stop and go this other route is any better. Does anyone have an experience with such? I am pretty confused. I do need to do my face. I just want the best possible result and am not sure from what I read.