Am I just being paranoid?

I have neuropathy in my feet - not really bad, but I do need to soak my feet 2-3 times a week, and I massage them with cream every night as I can get burning sensations that keep me awake. Tonight I noticed a tiny dark mark at the base of a toe - it's tiny, no more than a pin prick, but I have read that black spots could be a real problem. I saw my specialist just last week, and am not scheduled to see her again for two months. Should I get this checked out, or just keep any eye on it?