Natural remedies not work. Underarms?

All the natural remedies you told for underarm darkening.......I have been trying those from 6 months ..........but it is not working ,not even a change in shade of darkness can be seen , because of my mistake of using a razor for hair removal which I tried 2 yrs ago.............but I completely stopped that after realising it's disadvantages..................i consulted an ayurvedic doctor for that ....he gave me a powder which was to be applied with rose water ............but all in vain .........the razor has left permanent patches on my underarms.................my mother wont let me visit a dermatologist as she believes in natural things only she says I m too young to have laser treatment or something like that.......... Please tell me is there any other and cheaper way of getting fair underarms?