about 25 years ago I fell and hit the back of my head on a cement porch.  Not unconscious only a small lump formed.  It has been the same for about 25 years but now it appears to be getting a bit larger.  No pain, very soft under the scalp in the back of my head.
Hi, Difficult to say, it is probably nothing. I recommend you have an ultrasound just to get it checked. Hope I have answered your query. Let me know if I can assist you further.