The question is for my husband. Has has back problems. He had a nerve block treatment in his thigh about a month ago. Since then he has complained about pain in his heel. I just took a look at his heel and there is a dark spot where he says the pain is. He’s due for another treatment on the 24th. He is on his feet all day for his job. He has just changed doctors because he other doctor retired. We’re trying to find him another one, because this one doesn’t seem to know what to do for him. Do you have any idea what the dark spot is and why he is having pain.