I Am A 36 Year Old Woman And Ive Recently

i am a 36 year old woman and ive recently discovered a strange substance on my tampon, the likes of which ive never seen before. I can only describe it as shreds of loose cut tobacco in appearance and color. I do have a history of polyps as well. My last 4 periods have all began 1 to 2 weeks early as well, this is a symptom i recall from the vaginal polyp i had removed 6 years ago. However it is really the loose tobacco like stuff that im most conserned about now.