How do you keep the results of Triluma? I have been using it now for 9 weeks and have stopped, as directions indicate. I am now using a regular generic 4% hydroquinone cream mixed with Retin A .1%. I never did well with this type of hydroquinone alone, so I don't know if the results of Triluma will hold. What have you all done after Triluma has left your skin looking so good!?