Chances are that you had this vein prior to the treatment with botox. Have a look at your photographs prior to the treatment and I'm sure you will see the same. You have nothing to worry about and good luck from New York City
Thanks for the question! It isnt normal for botox to cause vein formation - but it would be too soon any case for the botox to be exerting any action. Was this definitely not there before? It might be worth checking old pictures to compare. If it is an irritated vein, and new, if its not painful it should go back down int he coming days. If it is painful I would get some medical advice.