Why Is My Skin Turning Dark?

hii,iam 28 f from hyderabad, past 15 yrs my neck was dark i thought it was pigmentation, later my back became dark ,and since 4 yrs even my hands became dark , doctor is saying its macular amyloidisis, tried laser and chemical peels,but it became more dark,iam geting maried soon , i want to lighten my complextion as soon as posible,ayurvedic ,alopathy,homeopathy,any treatment is ok for me i dont want it to spread more and wan to remove it from the root