I haven't had my period for the past 6 months, since we migrated from the Philippines to Canada. At times when I should be having my period (2 weeks after I notice my ovulation), I get blood stained discharge. I think my discharge has an unusual odor. And for the past year, I've noticed a mass that comes and goes on my vagina.
I wouldnt jump to conclusions about cancer but that is DEFINITELY not normal, you really need to go to a gyn. soon in case it is something serious.
you are fine. everyone is different and irregular sometimes. 6 months is a long time, but it happens to many girls. also if the mass is going away, it is not a tumor, cause a tumor would not go away. get a little gyno appointment to get piece of mind.