My dog has a lump on her chest that I suspect is a fatty tumor and when I pet her sides, it seems like it feels hard to the touch (hard to explain) Should I be concerned? Also, she has been chewing herself and scratching and has red inner thighs and hot spot. We put Frontline on her, but I don't know if it's a flea issue. I also gave her a bath with oatmeal shampoo. Anyone dealing or have dealt with these issues?