Talk to Cancer Specialist / Oncologist on Tumor On The Scalp Of Head Left Side

I have this tumor from almost 12 years it grows slowly over time and does not hurt or anything..but for the last 2 years it feels like a discomfort in that area and now I feel like a little pain in that area sometimes when I get angry or stressed the pain occurs also but not severe but a little bit the tumor is of the same color of my skin no redness or anything and its hard when i touch it and not moving but I think still on its place...what should I do next get a CT scan immediately?pleas suggest me something good and what can it be what are your thoughts on this?