what stage of the chicken pox spot can i start applying BIO OIL???

[daddy21]

DD has had a very nasty case of cp, the scabs have come off (rubbed off so a bit raw still) and there are awful looking pits now on her face around 10 pitted chicken pox marks on her face and around 20 red marks, not to mention her neck and body being covered in prretty much the same. I have read though the threads and noticed a lot of people have been using bio oil and i have got some ready, does anyone have any good advice for the pitted chicken pox & at what stage did you use bio oil? we are so gutted that all the deep nasty ones are on her face. tia