About 2 months ago I noticed that a mole on my neck was emitting heat and became raised almost like it was ulcerated. I get this constant pain in my neck and sometimes the mole is itchy. It also crusts over and becomes very dry. When inspected the mole had several different colours within it; black, brown, grey, red, pink and purple and even white, asymmetrical, red around the edges of the border. Luckily I have an appointment with a dermatologist this Thursday. Should I be concerned?