How can I help "cure" Vitiligo [details inside]?

Hello again Fluther,
I have been very recently been diagnosed with Vitiligo. I’ve had issues with it for the past year (but haven’t been able to book an appointment) and right now, it is a bit all over my torso, a spot near my genitals and a small spot that just started to develop on my hand. Now my doctor just told me there is no cure for it and because right now it is only mild and not focused in one area, UV treatment might be a waste so I was simply prescribed a creme.
I would like to ask anyone with or without past experience with this if it is possible for vitiligo to stop spreading on its own? Also, because of the fact that vitiligo is [from what I understand] issues that have to do with my immune system, does it help if I start doing more sports and eat more healthy to “reinforce” my immune system? If anyone has any other tips, feel free to let me know!
Thanks in advance guys! :)