Well, if you really want to know what I think - I think Jan has a lumpy head.
Sorry, since I have no mesh, screws or spackle in my head, I don't really know too much about the whole thing. The neuro patients I took care of when I worked as a nurse were pretty well put back together by the time they got to me - or they were in such bad shape that we didn't worry too much about their lumpy heads.
It could very well be a thickened area of scar though. I know I had a raised area, like a ridge, I guess for a while after my surgery, but eventually it flattened out pretty nicely. Now my 7-12 scar feels that way, but I know it's better than it was, so I'm sure in time it will calm down.
It's probably not a big deal and they probably won't do anything about it, but I think I'd probably want to ask the doctor what he thinks just for my own knowledge. I think it would be hard to actually feel the mesh through the skin though - we're not talking re-bar that they use before they pave your driveway - it's a very lightweight, fine mesh they use.
But let us know what the doc says. I'd be interested to hear what is making you lumpy!
Lori