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The most common cause of what you are seeing is a herpes type virus. It's more common in some breeds than others. You should go ahead and see the vet with her for an exam and to find out exactly what you are dealing with. Then you can get an appropriate medication. Herpes in pets is a virus and is much like the problems that people have.
Let me know if you still have questions.
They might or might not. If these are truly acne, you can clean them with an alcohol swab and it should help to clear it up. I would be concerned (if these are pimples) that you are seeing contact dermatitis.
You should also evaluate the food bowls and water dishes. Some dogs have allergic reactions to metal bowls and you will see lesions that look like acne but are not. If the bowls are not cleaned well, it also might be a bacterial problem.
Sometimes there aren't any pustules just black grainy/sticky stuff around the lips that scrapes off easily - sort of like blackheads gone wild. You can try cleaning it up with alcohol at home - sometimes that is enough to help if there is no other inflammation or pustules. Calendula gel is a good antimicrobial and skin healing promoter. Plastic bowls can cause a contact dermatitis also, but this sounds more like acne.
Your vet can quickly diagnose this for you and discuss your treatment options.
I hope this helps more!