Blue toes

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I allways have freezing cold legs and feet but just recently my toes have started turning blue, more so on my left foot. My little toe on my left foot is the worst, it sometimes is almost black. I have just started to develop a raised bump on my foot just before the toe, the toe goes blue after the bump, and just before the bump i now have a small indent in my foot which isn't disappearing

Any ideas as to what could be wrong?

Thank you