Doesn't Belong Here

A 40 year old woman presents with urinary frequency, urgency, dysuria, and urinary retention. She's seen multiple physicians who have ruled out UTI, interstitial cystitis, and kidney stones. Here symptoms are recurring, happening mostly around her menses. She denies fevers, chills, weight loss, and hematuria. A pelvic ultrasound is negative for hydronephrosis but does note ovarian cysts. Finally, she undergoes a cystoscopy which shows this on the posterior bladder wall:

Challenge: What is it?

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