Facial rash after Botox

It is unlikely that your rash is related to Botox. People can have allergies to the preservatives as well as to the topical anesthetic agents or skin preps used immediately prior to injection. If it persists, I recommend following up with your injector. Best, Dr. Emer

Great question- 
A picture of the rash would be really great in helping you. Next time I would forego the topical anesthesia and see what the results are. I've never seen botox cause a rash- it's a natural occuring substance and thus shouldn't be an allergen. Also, asking how it's mixed- it should be mixed with preservative free saline. 
Consulting with your injector is always a good idea. Lastly, try to change too many factors at once to identify what the problem is... ie. just don't do the the topical anesthesia next time and keeping all other factors equal see if you have the reaction. 
Hope this helps and God Bless!
Dr. Robb

Thank you for your question. It is very unusual to have a rash due to Botox. It can be very possible to have an allergic reaction to the topical analgesic. However, your rash can also be caused by other negligible additives in the Botox injection. Also, some injectors use preserved saline to dilute the Botox, and this may cause an allergic reaction. If this persist, I recommend having a follow up with your injector so a treatment plan can be determined for you. Best of Luck!