Lexi has had 4 sores on her belly for 4 days now. i have washed them off and applied antibacterial ointment. they are still there. She is 9 and i'm worried about cancer. She has a lot of lypomas. Can some be cancer which has infiltrated the skin. She was at the vet office 3 mos ago. other than the benign lumps the vet said she was ok. I'm worried. She mainly sleeps on the side the sores are on. please advise.