I am dealing with post acne scarring.. some scars are red and others dark..and I have been suggested to apply aZelaic acid 20% at night for 30 mins followed by Demelan cream over it (without washing) and let these stay overnight.. My concern is that will the ingredients of demelan reach my skin surface since I hv put aZelaic underneath..Moreover there is more redness of scars after applying this Kindly help!