I thought so too. Her previous vet wrote it off as a non-painful Sarcoid, and thought it best to leave it alone due to location. My new vet thinks it should come off, arguing that Sarcoids can get worse and cause big problems. Not sure which way to go on this.
I tend to agree with your vet in this case. The rubbing in her thighs as she walks can certainly irritate the sarcoids. Just an irritation and a place of moist darkness- perfect for secondary infections.