I got my ear pierced and developed a keloid (piercing didn't close). with steroid injections is there a chance it will grow back to its original size?

Yes: You should continue follow up, with your surgeon and consider pressure earrings or silicone sheeting.

Less chances: It is less likely that they will grow back to the same original size, with steroid injections also ask your doctor about pressure ear rings.

Keloid Rx: The safest approach is silicone tape/gel (myscaraway, from walgreens/online), steroid/bleomycin injections immunosuppressant/chemotherapyagent) only in pro hands, electron-beam radiotherapy, almost never excision unless radiotherapy can be guaranteed within 24hr after excision. Be very careful or it will be made worse by cutting it! close follow up for 2yrs+ to monitor for recurrence essential!

PISR: If you had a recent piercing and developed a lump it could be due to infection and in this situation see your doctor for treatment of the infection & avoid steroids. If your physician or plastic surgeon have told you that you have a true keloid then they will recommend pisr treatment sequence (pressure, injection, surgery, radiation) or a variation thereof.Steroid shots will not cause the recurrence.