That does look very painful. Please be very careful.
Soledad, I didn't know cat bites did that either until one day I was watching Emergency Vets and this lady's cat had been impaled on a fencepost and she went to get it off and it bit the heck out of her hands. And when she took it to the vet hospital, they said "Don't even wait for us to look at your cat, get to the Emergency room now." She did but she still ended up having to go to surgery to have the infection debrided from the joints. She was also allergic to antibiotics so that didn't help matters either. Said that if she would have waited she would have lost her hand!