It would seem that microscopic black holes only exist in theory, and that theory would also extend to say that they would rapidly decay. Not that they actually do exist.
Wiki
Another interesting bit of propaganda in that link to the LHC:
They try to placate you by saying "look at these little protons....each has no more enrgy than a mosquito in flight..."
But in reality, they want to accelerate those cute little protons to close to the speed of light and smash them together, per another portion of their website:
Well the definition of momentum is
p = mv
p= momentum
m= mass
v= velocity
When the velocity is as high as close to the speed of light (300,000,000 m/s) the mass of whatever you are moving at that velocity is really a rather insignificant part of the equation.
A weak analogy:
A bullet does not weigh very much, but when you accelerate it down the barrel of a gun, it aquires alot more *oomph* doesn't it?
Scientists play it "cute" with crap like that, just like we all do. But when they make a statement, it comes from Scientists "trust us".
Critical thinking must be applied to all fields.
I'm not saying anything against the LHC, or think it's a doomsday device.
But I do find it intereting the way they presented the information above. I think it illustrates rather well that scientists quite often "cook the books" to present the information how they want it to be seen.