Dear firstly attach photo of your skin so that I prescribe you best medicine

Hello. Don't panic,there is solution for your problem in Ayurveda. Take paripathadi kada 4-4 tsp +4-4 tsp water afternoon & night. apply durva juice to dark spots. and also apply evenshade cream (charak) at night to spots.

Hello there..... For these marks you can use cocoa butter or vitamin E creams. Topical treatments with acids and chemical peels can be effective but can take a while for the skin to totally revert to its normal color.  Microdermabrasion can also be done, but this might require several sessions.  Skin resurfacing using lasers is also an option. ... Consult your Dermatologist.....