Hi,
How prominent black marks are depends upon your complexion and it is caused due to increased melanin production and increased collagen tissue on injury site. Usually these should reduce by them self with time but sometimes they might take months to vanish completely .
Recommended methods include usage of aloe-vera on the spots and lemon juice application(which is a natural bleaching ). In this condition hydroquinone, steroid creams and other such creams are recommended but a prescription i ...
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