And the 1988 case did spontaneously heal without treatment only to return. (A case of exfoliative cheilitis.
Postlethwaite KR, Hendricks NM. Br Dent J 1988; 165(1): 23)
I suspect spontaneous healing reflects the absence of an allergen or stressor rather than any miracle. And I think most folks around here aren't gonna wait around for anything spontaneous. That said, congratulations and go slowly to find out what it was that did the trick!