HELLO fello ferreteers!!

I have a question seeing if anyone can be of help or has had this happen to their lil fuzzes before. My girl Saffron has this pinky sized blister, i guess you could say blood blister for when she did pop it once it was bloody, on her left ear. its the color of her pink ear skin and you can see some of her veins in it too like the blister is just now apart of her ear.  it went away once than came back, and some times in between she kept popping them however she has been, and than recently its been bigger than ever! and THAN it gotten smaller. what is this? and how should i tend to it? of course ill go to the vet eventually but for now im just monitoring and seeing what else comes from this weird blister lookin deal. ill post a picture later when possible. 

she is and has been acting normal, she has had this for maybe 6 months now? i dunno if its some sort of about to be tumor bump or just a litle infection on her ear i can tend to myself or an allergy of some sort? but it sure is annoying for me and her! any opinions thatd be great thank you!