I have a 10 year old maltese/pomeranian but over the last few years her skin on her belly started to get this dark look to it her skin use to be pink but now it just looks dirty and it seems to be starting to spread very slowly over the rest of her, she also has this lump on her belly the lump is kinda lumpy it started out under her skin about the size of a nickel and now its out and you can fit it in the palm of your hand its that big also the pink part in the corner of her eyes closest to her nose seem to swell but she acts herself most of the time. Do you have any idea of what she has or what I can do please help thank you for your time !