Hello. Thanks for using this forum. Any changed in bowel habits or consistency of the stool have to be investigated further. As in your case, the whitish substance along with the stool can be anything due to changes within the large intestine or the distal part of the colon specially the rectum
. Hemorrhoids would usually be associated with bright streak of blood along with stool which can be both painful/ non painful associated with mild to severe prolapse of mass from the anus. Advise would be to consult with your doctor so that further investigation with anoscopy and colonoscopy
can be done to rule out the above. Regards.