Would Valtrex (valacyclovir) work now? I feel like I have been having an outbreak on my face for 3 months after fellatio. Itches and burns but looks like acne.

Staph. You have a staph infection with a possible secondary yeast infection. This is not herpes and Valtrex (valacyclovir) would not be appropriate.
Get seen . Best to get the rash seen by a physician and get started on the right medication. You want to make sure you are taking the right medication for the problem. Might be acne or herpes or a bacterial infection or even an allergic type reaction. Has already been bothering you for long enough. Could try Cetaphil non soap cleanser until seen. .