My theory on the relevance of Stone's feet to the show:
When he had eczema, he was a social pariah. Nobody was close to him or wanted to be around him. When his feet were cured, basically nothing changed. He thought when his feet were cured, he'd be able to be "normal" again. Still, his son wanted nothing to do with him and Chandra ignored him when he showed her.
When Naz was convicted, he became a social pariah. People in the prison wanted to kill him and his family+community was severely impacted negatively. When(if) he is found innocent, he probably thinks he could go back to living a normal life. However, his mother will probably believe he's guilty and want nothing to do with him. Also, people recognizing him and his prison hand tattoos will make it unlikely that he'll be able to go back to his normal life. Also his family+community would still be negatively impacted.
I think this theory makes sense because the point of the show is to illustrate the problems with the justice system. One problem being, when someone is accused of a very serious crime and found not guilty, people of the general public often still see them as guilty.