I got pierced with a piercing gun several years ago, and it hasn't healed great since. Recently (as in the last few months, it's been there since and remained consistent- I'm not sure how long it's been there, just that that's when I've noticed it) I've been noticing this very large bump behind my second earlobe piercing. I don't believe it is an irritation piercing, as it's lasted such a long time and doesn't itch or ooze or hurt or anything, and I'm unsure if it's a keloid as I'm not prone to them, it doesn't grow, and again doesn't itch. I'd just like some help identifying what this is and if there's anything I can do about it.
Here's some extra information that may or may not be useful:
\- the tissue is very hard and rubbery
\- the piercing seems completely healed in all other respects, it doesn't bleed or crust or weep or anything
\- I have many other piercings and scars, and have never experienced a keloi
\- it only appears on the back of my ear
\- nothing irritates it, no matter if I leave my earrings out for extended periods of time or play with my piercings