What do you do about seeing intermittent drops of blood after a long cessation of menstruation, and do you consider it menses that necessitates abstaining from prayer?

The blood you saw recently is not considered menses by the majority of scholars because its total duration does not reach a day and a night, which is their minimum period for menstruation. However, according to the Maliki school, it is considered menses, and ghusl (ritual bath) becomes obligatory after it ceases. Acting upon the view of the Malikis is more cautious.