I've noticed this on my mums neck this morning. I had noticed it a bit a while back but it's def got worse. Obviously I will be taking Her to the doctor to have a look at it as soon as possible. I've googled images but nothing looks like this. She does have a history of cancer, and had a mastectomy a couple of years ago. Could it have spread to here? It's on her neck the same side as she had the cancer.