Thank you for your question. If you are prone to cold sores you my want to consider taking Valtrex before injections around the mouth. As Botox injections can stimulate a herpes simplex 1 outbreak. Best,
I would prophylactically treat you with an anti-viral the day prior and post Botox if it is needed around the mouth area. HSV can present itself anywhere on the face post trauma; however, it is rare post Botox injection.