Macbook Pro Retina, 15-inch, Late 2013 temperature at 96C

I've had my MBP for about 3 months and I've notices some heat problems to the point where it's really hot to touch above the top keys, in fact right now it could burn my finger if i held it there. It says the temp is 96C. The fans were not going above 2000 rpm so I downloaded an app and I boosted up the fans to 4300 rpm and now it's at 71C. I'm not really doing anything but using google chrome and working in Adobe Illustrator.

So,

A) What temperature should the fans come on at?

B) Is this normal? Should I be worried

Thanks,

L