I am asking a question for myself, not my cats. They are thankfully fine for the moment. I have had this black spot under my toenail for quite some time, and I really didn't think too much of it, until I started doing some research on the Internet (bad idea). I found it that it could be something called sublungal (sp?) melanoma, in other words--cancer. I know that you are not doctors and can not diagnose, but I'm just asking, have any of you had a similar problem like this with your toenail or do you know someone who has? Did it go away on its own? Did it turn out to be something not serious? It is important to note that I don't recall doing anything to my toe that would cause a bruise under the nail. I have stubbed my toe before, but not recently. I took some pictures of it, but they're not that great. The room is kind of dark.