Assuming the Botox is not injected into the neck (eg. for neck platysmal bands) and the filler is not injected into the lower face / neck, ThermiTight for the lower face / neck could be performed at any time following the injections. It is always a good idea to let the treating physician know about any other procedures you have had done and when.Best wishes.
Since Botox and Dermal Fillers have virtually little to no downtime, ThermiTight can be used on the lower face and neck as soon as possible after your non-surgical injections. Discussing this option with your board-certified plastic surgeon can help confirm what treatment plan is ideal for your aesthetic goals.