Why do I have dimples on the lower part of the buttocks after my BBL? It's been almost 4 weeks.

Hello dear!!
Thanks for the question and provided information as well.
You are still early on the healing process, it can take up to six months to see your final results, so please be patient. At the stage you are in, inflammation and irregularities are normal.
If you have any concerns, please follow up close with your plastic surgeon.
Good luck :)