Hello, I can understand your concern for the white patches on arms, fingers and legs. After analyzing your query I can get that you might have the condition known as vitiligo. In your kind of condition I prefer to do skin examination along with wood’s lamp examination to differentiate between different possible causes of superficial or deep hypo-pigmentation. If required I also go for skin biopsy of the affected area to know the exact entity of the problem. With proper different types of treatment it is quite possible to regain the color as early as possible. I generally give oral and topical steroids as basic treatment and then start immunomodulator drugs if the diagnosis of vitiligo is confirmed. I suggest you to meet a dermatologist and get her skin analyzed. All the best.