Hi....I am Dr Manoj....
When the hair follicles get destroyed completely by a surgery done on the scalp
there are lesser chances of getting the hairs back.....this is what we call cicatricial alopecia
...you can just cover that part with long hairs....hair transplant
may be tried....see whenever you get any kind of infection on the scalp you need to treat it as early as possible to avoid permanent scarring....don't worry