Piercing hurts! (With update)

I got my ears pierced a month ago and my left ear hurts occasionally but not my right I wash my hands before cleaning,I clean them front and back with the stuff they gave me,and I twist them. Why does it hurt it? Is it infected or something? I was gonna switch them out for the first time but I decided against it because my left ear hurts
**UPDATE**
It’s infected :/
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