If yes, for how long should you apply these before having microneedling done.
Micro needling itself with out energy such as RF has less chance to cause PIH than say, RF or lasers. Having said that, the most important aspect of prevention is avoidance of UV and the use of sunscreen BEFORE and AFTER the procedure. If you are prone to PIH, yes Vitamin A and C can help, but the use of HQ prescribed by a specialist is better. All the best, Dr Davin S. Lim. Brisbane. Australia.