I've got this thing on my abdomen. I've had it for about a year and lately I've noticed it's changed. The dark colour on one side has appeared. It's been on my mind to get it checked. Today I noticed it's been bleeding. Any ideas what it is? I know it's hard to see from a photo. I've got an appointment for the 11th but the fact it's bleeding is freaking me out and I wonder if I've left it too long 