Okay sorry I didn't post sooner! The vet said it's just a cut, probably from the brush around our house or we found some glass outside our house...someone broke one of our windows out
I'm sure Jordan must have found it before we did. We'll be watching her much more closely from now on. The vet just suggested keeping it clean and putting neosporin on it until it's completely healed. Already the wound is closing and looking so much better. I thank you so much for your concern and advice. It made me feel a lot better to take her to the vet!