About a week ago, I noticed my dog had a little bump in his tummy, it looked like a sack full of liquid, I didn't worry too much since I have another dog who usually gets bumps in her body due to her age. A few days later, my dog started licking and touching the bump in his tummy and I noticed it started bleeding just a little bit, kind of like when you scratch your skin too much and I thought of letting it heal naturally. A few days ago, I checked on him and noticed the bump is gone but now there's a wound in that same spot, it's not bleeding but I can see his flesh, the spot has no skin! (see image) I took him to the vet yesterday and he said if it was a normal wound it would've started healing by now, and said it could be a cyst. He told me to keep the area clean and gave me some ointment, and he'll check on my dog in a couple of days before taking a sample of the skin to the lab. I want to have a other opinion since I'm worried that this thing can be transferred to my other dog! Has anyone seen anything like this? Could it be a cyst or a tumor?