I am planning to get an 'inflammation injection' for pustular acne scars. Are there any side effects or precautions I should take?

Hello. Recently, possibly due to stress, several large, hard, pustular pimples have appeared around my chin, and I am even experiencing pain. I tried to squeeze them out at home, but nothing came out, and I am worried that it will only leave scars. Therefore, I am planning to get an anti-inflammatory injection at a dermatology clinic. However, I am a bit worried because I have heard scary stories from others that if an anti-inflammatory injection is administered incorrectly, it can cause the skin to collapse.

How long does it usually take for the inflammation to subside after the injection? Also, I am wondering if there are any special precautions I should take after the procedure to avoid side effects like indentation. I would also like to know if it is okay to wear makeup on the day of the injection, or if it is better to apply a patch. Since this is my first time, I have so many questions. I look forward to valuable advice and care tips from those who have experience with anti-inflammatory injections! Please leave a comment.