Should I be concerned? (Description)

I just felt a small, hard ball in the lobe of my ear, close to where my piercing is, but further to where the lobe meets my head. I know it's not the metal from my piercing because that's still in place. I haven't worn earrings in a long time. The little ball-thing doesn't hurt unless I mess with it. Any clue what it could be? Should I be concerned?

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