A facial before the wedding is a good idea, as long as it is done in time. What matters is not so much having one as when.
Why three weeks to a month before the wedding
After a facial or a peel, spots often come out while the skin recovers. If you have it between three weeks and a month before, the skin has time to settle and reaches the wedding day calm. Any closer, and those spots can appear just when you least want them.
What if I have a breakout the week before the wedding
Even so, a spot or two in the days before the wedding is very common, even if you have had nothing done: nerves are enough. It does not matter. That is what makeup is for, and it camouflages it.
Which treatments are best left until after
Beyond the facial, I do not recommend invasive treatments or anything out of the ordinary before the wedding, for the reasons I explain in how to prepare your skin before the wedding.
Self-tan is what brides ask me about most. If you want to arrive with a little colour, have a spray tan applied by a professional who specialises in it, never a home self-tan. There are professionals who do it very well.