What Causes Late Periods And Spotting?

Hey, I am layla an I have many questions. My first question is, what does it mean for my menstral cycle to have been late last month an only spottin every now and them noe? My 2 question is, what could I possible have if I have a bump or sore ob the outside of my vigna that has pulse coming from it and hurts to be touched or rubbed up againsr something, it is also hardening. (an I habe a smell and a whitisg,yellow sometimes freen looking disxharge, what is that?)