I purchased the dark spot mask and received the serum the mask if you leave...

I purchased the dark spot mask and received the serum the mask if you leave it on for the amount of time suggested it really made my skin burn and very red afterwards. I had to reduce the time left on my face and then I was fine I’ve used it twice now and haven’t seen any results yet the serum did help to soothe afterwards trying to clear these spots I’m hopeful