Signs That You Got An Infection From A Pedicure What Are The Signs Of An Infection In A Piercing?

What are the signs of an infection in a piercing? - signs that you got an infection from a pedicure

I had lots of piercings, but is not infected. It gave me is still very painful after I managed to break 4 days ago. I do not know what a piercing is infected. Does anyone have any experience with this?