Is microneedling RF permanent?

In the context of your question , IF you have a response to RF, the results are permanent, providing other variables do not change (more weight etc). Microneedling RF is an extension of microneedling with ‘energy’. Generation one devices such as Dermapen/ Skin Pen etc. use needles without heat to remodel collagen. Generation Two devices are microneedles that are not insulated, hence heat is delivered along the length of needles. Examples include Secret RF and Intensif. Generation Three devices use insulated needles to deliver heat at the point of the needle. Examples include Infini RF, as well as Genius. 
Newer generation devices will generally give better outcomes, however with insulation, the safety of microneedling RF devices is usually better than generation two machines. With insulation the incidence of skin colour darkening and ‘grids’ secondary to ‘stamping’ is less, however it is largely technique dependent. 
Microneedling RF should be viewed as a tool to be incorporated in the suitable clinical context. As with most other ‘fractional technology’ 3-5 sessions spaced 3-6 weeks apart will give the best results. Be guided by your specialist.  All the best, 
Dr Davin Lim and the team at Clinic Cutis
Brisbane. Australia.