Why do my ears bleed from wearing earrings?

I got my ears pierced when I was 6 & stopped wearing earrings when I was 10. When I turned 19m I started wearing earrings every now & then. After half a year, one of my ears starts to bleed whenever I take out an earring. & if I try to put it back it, it starts to feel like it's on fire. So after having my ears pierced for years, I don't get why this happens. Anyone know what's going on?