Is Botox still effective at the site of a broken blood vessel due to injection?

Any time that you are dealing with an injection, there is a risk of hitting a blood vessel. However, this shouldn't interfere with the efficacy of the Botox. Sorry that you experienced this, but all should be fine. Best, Dr. Nazarian

Thankfully the mechanism in which botox works isn't effected by swelling but sometimes the extra volume in an area could result in the botox moving or diffusing into an adjacent area. This is rare but can happen.So there is no problem with the botox not working even in the presence of swelling but there is a slight chance that it may drift into a neighboring area. In the forehead though this shouldn't be much of a problem.I hope this was helpful.

It is possible to get bleeding bruising and swelling from injections.  Please see your physician if you are concerned.  Best, Dr. Emer.

You are correct in that the injector probably hit a small blood vessel. This does happen on occasion but usually if the injector is careful and can visually see the vessel, they can avoid it. It does not interfere with the effectiveness of the botox in that area. Applying gentle pressure with ice afterwards can minimize the swelling  and the bruise. Thank you for your question!

Your botox will still work.  Any time you use a needle to inject something into the skin there is a chance of bruising.  Typically our botox needles are so tiny that many people receive injections without experiencing bruising.  Do not worry though- your botox will work!

It is possible to have a bruise or small bump after a Botox injection but it will not affect the treatment result.

Anytime there is an injection, there is a chance of a blood vessel being hit. It will likely have no effect on the Botox.  If there is a problem once everything has set in, your injector can add a little back into that area.  Try to forget about it for now... It is likely fine.

Botos works on muscles and a broken blood vessel will not keep the Botox from getting to its site of action so there is nothing to be concerned about

Yes, Botox will still be effective. It binds to the muscles in the area and the little bit of swelling and bruising will not affect that. It is not uncommon to have a small bruise or swelling in these areas. 

Tia,Thank you for your question.  Botox will still be effective.  You likely got the scenario exactly right and when the injector injected the botox they likely hit a small blood vessel which caused it to bleed under the skin forming a small bruise or hematoma.  The ice controlled the bruising and the small hematoma will resolve quickly but it will not affect the outcome of the Botox.  In the future a small device can be used to locate your blood vessels under the skin so as to direct the needles that they do not go anywhere near them thus avoiding you nicking the vessel and causing the bruise.  The most commonly vein illuminator is the Accuvein and it works very well for cosmetic procedures, particularly for patients that have a history of bruising.  Thanks again for your question.  Regards, Dr. Matt Elias