Hi, thanks for posting your query
The white spots
are probably post inflamatory hypopigmentation
due to the use of diprovate
Diprovate is a potent steroid , which can cause hypopigmentation.
You may stop using diprovate cream and review with your doctor regarding its use. The colour may reappear in about 3-4 months after discontinuing it.
Chance of Vitiligo is minimal but it has to be ruled out as you have a positive family history. You may get a skin biopsy
done for that.
Hope this solves your query