GIRLS ONLY!!(plz)?

ok, there is this greyish brownish color stuff variety of where i would run pee(in that area)i am just wondering wat is this??is it common?? AND THIS IS TORI'S SISTER!! that is tissue it happen to me too when i was 11 when you are roughly speaking to start your period your uterus have a brown line of callous slimy stuff called tissue and when you are getting you time of year it leaves the body and that is what you are seeing not everyone see it because it can be minor. i do not conjecture you have anything to verbs about hope this help
maybe. possibly calling your doctor, might need a checkup