I have a mole on my lower back that is usually skin colored and minimally raised. About a week before I start my period it becomes sore, itchy, raised and changes to many different colors. It is currently very sore and red, purple and black in color. When this first started happening (about four years ago), I saw a regular doctor and he said that I probably pinched that area somehow. I have not been back to a doctor since then but this mole is getting larger and more irritating.