An 8 mg steroid injection 20 days before a BBL may be acceptable in some patients, but it should not be treated as automatically safe. You need to tell your plastic surgeon, anesthesiologist, and the doctor giving the injection before you receive it. They will want to know the exact medication, dose, injection site, reason for the injection, and whether you have diabetes, immune problems, infection risk, or are taking other medications that affect healing. Steroid injections can temporarily affect inflammation, immune response, blood sugar, bruising, and wound healing. A single small joint injection is different from long-term oral steroids, but timing still matters before a procedure like BBL, where wound healing and infection prevention are very important. It is also important that the injection is not placed near an area that will be used for liposuction or fat transfer. If the joint pain is severe enough that you need a steroid injection right before surgery, that may also be a sign to pause and make sure you will be able to position, walk, and recover safely after BBL. If there is any active infection, open skin problem, fever, or uncontrolled medical issue, surgery should usually be delayed. The safest next step is to ask your BBL surgeon directly before getting the shot. They may approve it, ask you to use a non-steroid option instead, or recommend postponing the injection or surgery depending on your health and the details of the medication.