Thank you for your excellent question. Most bruising is apparent at the time of injection. In order to minimize the risk for bruising, I recommend that my patients avoid NSAIDS (Advil, Alleve, etc.), aspirins and fish oil for one week prior to a planned injection. After the procedure, I recommend that my patients avoid bending, heavy lifting and strenuous activities such as going the gym for 24 hours. Delayed bruising is rare but can occur for up to 72 hours after the procedure. Icing is beneficial for up to 48 hours after the procedure. Arnica is also beneficial for minimizing normal postprocedure bruising and swelling. Hope this helps and best wishes!