Dec 25 i noticed slight green color on toilet tissue.same next day. two days later, green is gone but tissue is lighter brown and smell of vomitus ?

Unclear: The assumption here is that we are talking about stool? Stool can be various colors including green as it may be affected by what is taken in. Stool never has a good odor and although the stool is lighter in color it is unclear as to what to do. If the patient has only noted this and not other symptoms such as pain or bleeding, it is unclear if there is anything to do. Would observe and follow doc