The most common side effects are local injection site reactions-primarily redness, swelling, inflammation, pain, and bruising. More serious side effects can occur, and these will be discussed at your consultation. Non-painful lumps and bumps are common, and may be treated with massage after 1-2 weeks (wait until your follow-up appointment for evaluation and instructions) or possibly in some persistent cases with hyaluronidase, an enzyme that breaks down the hyaluronic acid filler. To minimize bruising, I recommend discontinuing all blood thinners such as ibuprofen/Advil, Motrin, Vioxx, Celebrex (all NSAIDS), high dose Vitamin E, and supplements (ginger, ginseng, garlic tablets, kava kava, celery root, and St. John’s Wort) which can thin the blood 1 week before. Avoid drinking alcohol for 24 -48 hours prior to your procedure as well (it is a vasodilator). Afterward, you may consider using topical or oral Arnica, Vitamin K cream such as Auriderm post-op gel, and/or bromelain.