Yes, it is safe or safer than laser or even microneedling RF in the correct hands. This is because heat is not generated. Trauma of any sort, even a mosquito bite can result in PIH, so you still need to be 1. Conservative in treatment 2. Extra careful with passes 3. Sun protect before and after...
Depending on the vehicle of the active ingredient VIt C, EGF, HA and PRP are all safe. Vitamin A tends to be more irritating. I usually tell my patients to place vitamin A 3-5 days after - when skin is completely healed up. This gives less chance of irritation. Dr Davin S. Lim
Thank you for the excellent question. Usually a combination approach provides the best outcome for the type of scars that you're talking about. Microneedling(Dermapen is a device which does this) in combination with subcision and +/- long term fillers generally provide excellent...