Hello,
To treat this scarring from cold sores on lips,keep on applying the vit E cream.Also use lip balm medications containing zinc oxide and sun screen lip balms before going out in sun.
If the symptoms persist then laser treatment can be used.Pls consult a dermatologist for that.
Hope it helps.Take care and pls do keep me posted on how you are doing or if you have any additional queries.Kind regards.