Ultherapy Dozens of Round Bumps Under my Skin on Checks, Jaw and Neck?

Jennie, it sounds as if you are having a reaction to the treatment or gel used for treatment. Blisters are fluid filled and not solid bumps, so I would think this is an inflammatory reaction from the heating of the tissues. Inflammation can look like red bumps or even like bug bites and should subside with cool compresses but sometimes needs a topical or internal steroid to quickly resolve the problem. Follow up with your Derm if these aren't resolving