What is known about nerve damage post ulthera? 12 weeks post ulthera and feeling tingling like prickling and slightly painful.

I have never heard of long term nerve damage with the symptoms that you describe at 3 months after Ultherapy. The depth of "damage" that Ultherapy can do is only 4.5mm and the reason why Ultherapy is so powerful is that the clinician is able to see exactly what structures are being treated. In general, we do not think of Ultherapy like you think of Botox or fillers. The work the Ultherapy does is permanent and will not wear off. You will, however, continue to age, so in a sense Ultherapy, like surgery simply resets the clock. The good news is that you have not burned any bridges and transferring fat to your face should be no different after Ultherapy as it was if you had never had Ultherapy done. 

I have never seen a bad outcome from ultherapy in my hands. Do you have before and after photos? If you feel hollowing then you can use fillers, fat or scuptra to improve it. Best, Dr. Emer.