Hi, i've noticed that a couple times over the past few days I have noticed a couple of white clumps attached to my stool. maybe a little smaller than a dime. They look soft and are very white. I have recently started a course  of doxycycline to help treat lyme disease after taking a course of amoxyciline and it not working. While on the amox I had gotten a uti or a yeast infection which has now gone away since being on the doxycycline. Could this be caused by any of these factors?