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As it happens, there are no proven natural remedies for morphea (no diet, creams, essential oils, etc.) although on the internet there is no stopping anyone from making outrageous claims for all sorts of cures for everything...and there are thousands of purveyors of false hopes, more intent on parting us with our money than actually curing our disease. Especially tricky is that often morphea will fade or even go away on its own accord within three to five years, even without any treatment at all -- and it is for that reason that many people are convinced that their cream/oil/vitamin/medication/food or whatever was the "cure" they were seeking.
However, in recent years they have found that UVA1 Phototherapy is a proven treatment for morphea. UVA1 is similar to a tanning booth, but the lights are a different (and more intense) wavelength. The thing to do is to consult your doctor (preferably a scleroderma expert, of course) and ask for a referral to a dermatology center that has UVA1 phototherapy equipment. (This is NOT to be confused with UVB lights or with lights for seasonal affective disorder or with full spectrum lights; this is not a do-it-yourself project of any sort. And centers with UVA1 are still pretty hard to find in most areas.)
UVA1 is about as close as you can get to "natural" yet still be effective as a treatment for morphea (and other types of scleroderma as well.) I hope you find this info a little bit helpful.