I'm getting married this summer and have chosen a beautifuuul strapless dress. But, especially before my period, I tend to get spots on my back, especially where my bra strap rubs the top of my shoulder. I also have marks from older spots. It's not too bad i.e. not full blown red painful spots all the time but I do want to sort it out. Question is how? I've started exfoliating and also using a mud mask that's supposed to help. So far results are not great...any ideas?