I have recently been trying a natural remedy for acne. I read of a study done on hirsute women to lower their androgen levels (which is what causes excess hair, oily skin and acne). It appeared to work for them, so I am trying it myself: taking one cup of spearmint tea a day and two cups a day during the follicular period of my cycle (it apparently also affects the amount of follicle-stimulating hormone so I am not sure whether to try two cups every day). However, I was only able to find a mixed spearmint, peppermint, green tea and stevia tea, so a pure spearmint one might be more effective.
I don't know how else to measure its effect other than counting all the glaringly obvious spots on my face, so that is what I did. In the beginning I had 22. It steadily lowered to only 8 or 9 very small spots when I was taking one cup a day. I took a two-day break when I went to visit family and the number of spots almost doubled in that short amount of time! By that day it was time to start taking it twice a day and in two days I am back down to 8/9 and they are even less obvious than before, so hopefully I will eventually be completely clear. My oiliness has also decreased so that I don't have to wipe my face as often during the day. I have not had skin this clear or oil-free in nearly 10 years! I am definitely going to order pure spearmint tea when this one runs out.
Keep in mind I am 21, so I am not supposed to have so much acne any more and I am thinking I do have a lot more androgen than the average woman since I am also very oily and have some excess hair. So if you only have spots and nothing else, this may work even better for you than it does for me because you have less male hormones to make inactive.