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to get rid from scar mark from injury
there are lot of home based remedy like cucumber juice its very effective in treating spots of any kind. You can also add some drops of lemon juice to this in order to make it a more effective treatment. This should be applied on the spots and left to dry.Slice pieces of cucumber and apply it on the spots. This works well with raw potato slices too. You can also peel and grate a raw potato and squeeze it to extract the juice.
You can also mix some sandalwood powder with a little rose water and apply this on your spots.
i hope this will help u out.if not than consult dermatologist