As I said, when he was on the long running Viet Nam drama "China Beach" playing a grumpy Doctor therein, the producers made him where a wig for YEARS, and he briefly wore a wig when Kes traveled a number of years into he future to meet him during season three's "Before and After".
Picardo is loath and more than familiar with "fake hair" but his appearance is a work of vanity based on his Creator Doctor Louis Zimmerman, Trekwatcher, if you were truly curious why it was decided to create a bald hologram?
Picard is a genetic mess. He was born with that thingy killed that idiot clone from nemesis and he's going to die from Irrumedic(sp?) Syndrone according to the future history semi-established in All Good Things... And there's some thing seriously wrong with his mouth or his nose, because Picard, just doesn't sound French. Considering his brother and nephew had the same issues, I'll say that that is a third congenital disorder ruminating through Jean-Luc's soup.
This is why we have Eugenics wars people, so that people ain't born into pain and then die form it. Obviously the Superman didn't make it into or, didn't want to make it into France while they were dividing up the world in the 1990s.