4 weeks after miraDry and I think I have nerve damage—what can I do?

This sounds like classic banding which is scar tissue forming bands under the skin. These can resolve on their own but I inject with a numbing agent and steroid and use a vigorous friction massage to speed things along. Stretching can also help.

Miradry is an excellent treatment for hyperhydrosis. Patients are very happy with results and truly grateful for this treatment option. Miradry does have the known side effects of bruising, swelling, temporary numbness and banding of the tissues post-procedure. What you are describing sounds like a tissue band. These bands resolve over time. In our practice we do treat the bands with massage, stretching and radiofrequency heat treatments. This treatment regimen has improved the few patients that had this issue and resolved it. It would be best to see your provider and have an evaluation.