There are some steps you can take to prepare for your injections in order to reduce post-treatment swelling and bruising at the injection site:
Avoid certain medications. Your doctor will discuss with you what specific medications to avoid, but these generally include over-the-counter pain relievers such as ibuprofen and aspirin, which can thin the blood, and supplements such as St. John’s Wort, gingko biloba, and ginseng. You should stop taking these medications a week before your injections.
Avoid certain products. At least 2 days before your injections, you should stop using products that contain retinol or glycolic acid (“anti-aging” products). You should also stop using hair removal cream on the area to be treated, and don’t bleach, wax, or tweeze the area, either.
Avoid alcohol. You should stop drinking alcohol at least 24 hours before your injections.