Doctor offered to repeat Ulthera after one month - is it safe???

Ulthera delivers heat into the skin to stimulate new collagen production to tighten the skin.  The improvement is not even seen until about 6 months.  If we do a touch up it is at 12 months.  So it is too soon for you to notice improvement and too soon to do a touch up.   

I would recommend waiting at least 4-6 months before retreating someone with Ultherapy.  It would be too soon to see much effect from a treatment after only 1-2 months.  There are a number of methods available to help reduce pain during the treatment, so you should speak to your doctor about the possibilities.  There are oral medications that can be given ahead of time or nerve blocks that can help to reduce the pain.  

It can take up to 6 months to see results from Ultherapy. Personally, I wouldn't repeat the treatment on any of my patients after only a month.

Not to defend the company that makes this device, or distributes it in the USA .... but, it seems to have lost control of who makes devices that are made with the name Ulthera outside the U.S. I don't think you had Ultherapy. Go see a reputable doctor who has the real device.

Unfortunately we don't know anything about you not even your age to guess why you don't see any response. You did not even post any pictures. I also don't know what machine your doctor used which you are calling Ulthera. Regardless, results are not usually visible for 3 months and it would make no sense to repeat treatment and add more tissue injury which makes me question your doctor's credentials and experience.