i am facing this problem from last 6 to 7 years.. and the reason it started was i wore tight sandle and the very next day i noticed spots on feet. but my mistake i used that sandle regularly as i dint realize that its coz of sandles.. but till day i realized spots covered my whoe front feet.. i tried many medicenes but no use.. i showed up to dermotolagist she said its coz i wore tight sandle and my blood vessels the thin 1 got damaged and she said somthing i dnt exatly remember now.. it was tat iron and hemoblobine mix and reacted in blood vessel .. she said its not harmful .. it will go with period of time by it self even skin grafting will not b useful .. it usually becomes lighter bt not disappears fully....

so if any 1 gets remedy plz do share with us