I have had to deal with the questions about my scars too and I know it can be hard. I deal with it usually by making jokes about them. My friends and I once did a 'join the dots' game with the scars on my stomach from all the revisions I have had, and believe me, there are many.
The easiest way to deal with everything is to remember that the scars and the hydrocephalus are who you are and nobody can change that. If people want to judge you because of it then they are the ones with the problem, not you.