Could this be melanoma or some kind of skin cancer? (Photos)

Please, help. I was watching a video on melanoma and I realized that I have something similar to what is described. It doesn't have weird edges or something. I don't know since when I've had this either. Please say something or I'll die thinking until the dermatologist appointment date which is in a week :( please. I also have strong depression which is made much worse by this problem. I'm talking about the dark spot in the attached photos.