Kind of freaking out right now. I've had this "mole" on my back for years and hadn't thought anything of it until I saw a piece on the news the other day about a rise in melanoma. After googling a bit, I'm worried that this spot might actually be cancerous. I had a lot of sun burns on my back when I was younger, so I'm really worried. My physical exam isn't scheduled until the end of October so I'm freaking out right now. It's about 1 cm in size, maybe? They say multiple colors are a sign of cancer, and it appears that there are different shades here. It looks rough, though. Attached is a picture. Should I be worried?