Heel pain?

Question: i have bad circulation and recently i have noticed my left heel has gotten hard from the bottom and it hurts when i step. im mostly barefoot all the time. anyway, is this due to bad circulation? can it lead to gangrene? im so scared it will. or is this something else? its not blue/purple. but it is darker in color plz help

Answers:
read the article near the bottom of the page on the first site

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