Even cosmetic surgery. I will be very grateful if you could treat this query as urgent as I said she is suffering from bouts of depression and we are at a loss. She is 25 years old now. She has been given lot of restrictions in her diet. She is otherwise healthy.
White patches can be due to various causes like infection, autoimmune disorders, burn etc.
Since your sister has consulted lot of doctors it is unlikely to be of infection. There are few conditions that cause white patches, which are not curable. But if the lesions are few one can get tattooing done with normal skin colour. Lastly I do not think there is any relationship with worm infestation and the skin rashes what your sister has. I have been asked to take fibrous food.