Dear Waschke Any time you get poked with a needle, you can bruise. Often these bruise are immediately evident. When your treating doctor starts mushes their thumb down on your face, you can be sure they have spotted a little bleeding that they are looking to stop before it becomes a bruise. In West Los Angeles, bruises are a big cause for concern. I am not sure if it is because we need to look or best or we are concerned that someone will think our spouse hit us (or our spouse might learn that we are getting service). I encourage patients to avoid things that increase the possibility of bruising. Most offices maintain a long list of these products. These including things like aspirin, advil, but also include virtually anything herbal thought to be healthful. Many of these products thin the blood in some way. If you are a product for medical reasons at the instruction of your physician, please seek their advice before going off these products. Delayed bruising can come about when bruising occured at a deeper tissue level and had to work its way to the skin surface before becoming visible. It is also possible to disturb the treated area and this can cause a delayed bruise. I tell my patients not to work out after treatment for 24 hours. One of the worst bruised I've seen was from a patient who did a spin class a few hours after an uneventful BOTOX treatment. So bruising delayed or otherwise is a risk of having these wonderful treatments.