F/19/AA I've been using tri-luma for a month now and it's helped some acne marks on my forehead but I'm trying to reduce the dark pigmentation on the corners of my mouth. Skinsentuals has 15% pure L-ascorbic acid (vitamin C), 1% alpha tocopherol (vitamin E) and ferulic acid. And tri luma has Fluocinolone acetonide 0.01% Hydroquinone 4% Tretinoin 0.05% Can they work together safety if I use them at different times?