Bump underneath second piercing?

So I have this bump underneath my second piercing. The piercing itself does not hurt- I can’t twist it and move it around all I want and doesn’t cause any discomfort. But sometimes when I move my earring, I noticed a pain on the back of my ear when I moved it up. I went to look at it and here is what it looks like:

This is about the best picture I could get of it :/ it almost looks like a pimple? but it’s right between my two earlobe piercings. anyone know what it is and how to treat it?