welcome to HealthcareMagic
Since your mother suffered fever
with some pimple or skin infection
which has turned white and little I guess it may be some sort of skin infection due to bacteria or fungus which may subside after treatment so please consult a skin specialist.As for bolli there is no disease by this name so what your mother is worried about or taking about is Vitiligo
whish is a disease of white patches which i think she is calling bolli.