How long after injections can Botox leak from the injection site?

Botox is injected into the muscle and will not leak from the injection site. By the time you leave the office from your treatment, leaking from the injection site is not a concern. Final results from your treatment will be seen within two weeks.

Sometimes during a botox injection, some of the liquid botox or perhaps blood can be felt running along the area of injection. We are not aware however of Botox leaking from the injection sites since the needle holes are very small with a 30 gauge needle. Hope this helps! Dr Joseph

It is extremely rare for Botox to run out of an injections site other than the first second it is injected. The needles used are extremely thin/small (generally 30-33 gauge).