Thanks for your query.
Looks like you have developed a herpes
infection over the lips.
Now since was the primary episode, you should have been treated with a short course of antivirals.
These have to be ideally started within 48 hours of the appearance of lesions.
Since now the lesions are dried up, you just need to apply a topical antibiotic
cream over the affected area.
Keep the area clean and dry.
You might develop recurrences of the same in future.
Make sure you see a nearby physician when you develop similar lesions again.
Hope it helps
Dr Geetika Paul